Bandwidth...

Hello!
this is the common error message I get when starting ichat:
2008-10-15 10:43:59 -0700: There is insufficient bandwidth to maintain the conference.
Detected 13 kbps upstream and 13 kbps downstream bandwidth; 50 kbps required.
So, I get there isn't enough bandwidth... is there a way of working around this? I have noticed that closing itunes has helped somewhat.. Is there a way to find the bandwidth when connected to wireless?
Thank you for all your help!
Lana Kay

Hi I have the same problem and my speed keeps changing every time I test it. Right now it says:
Download 1360
Upload 213
Bandwidth on iChat is none and QuickTime is Automatic. My video chats work with some people but not with others. Please help, thanks!

Similar Messages

Creative Cloud Files – Syncing issues/Bandwidth hogging – Does it ever work?

Having been a Dropbox user for several years I was keen to start using the 100gb of Creative Cloud storage to enable me to work on a project from home and pick up where I left off in the office.
However it simply doesn't work properly!
For example:
I worked from home on Monday and Tuesday on a project. All the files were successfully uploaded from my home Mac within seconds/minutes. I came into work on Wednesday and the files had not appeared in my CC Files folder. I rebooted my Mac and paused and restarted the sync and left it running, a couple of the files appeared but the process seems to hang fairly quickly. I've left it running overnight and my files have still not synced! the status bar at the bottom of the CC app shows "Syncing file 7 of 181 (9hr left)" but it never gets any further.
When syncing is switched on and running the process kills all the bandwidth of my work Mac causing outgoing emails to spend up to an hour in my outgoing mail queue, slowing web browsing to a crawl, hampering any other web usage/downloads/streaming/remote access etc. To prevent this I changed the preferences to only allow CC 50% of the available upload and download bandwidth.
I have repeatedly logged out/rebooted my Mac, closed and relaunched the CC app, paused and restarted the sync process and run the
rm ~/Library/Application\ Support/Adobe/CoreSync/options.tix
command in Terminal as suggested in another thread.
The files I am syncing are not even that large, in total I am only using around 3% of my storage.
Am I on my own in experiencing these issues? Or are other people suffering too?

Hi Matt,
In order for us to take a deeper look at what's happening here, we would need to take a look at the log files on both your machines. The location of the coresync.log file is included below.
Could you also tell me what version of the Creative Cloud Desktop app you're using (from preferences) and the spec of the Macs?
Log file location:
Mac - /Library/Application Support/Adobe/CoreSync/CoreSync-yyyy-mm-dd.log
(On Mac, you need to use the Go To Folder option from the Go option in Finder (menu at the top). Then in the pop up enter:
/users/username/Library/Application Support/Adobe/CoreSync/
Then select go, this will take you to the folder containing the .log files.)
Please email this to me directly on [email protected]

Memory Bandwidth 865PE Neo2 FIS2R & MAT

I read with envy the msi web page describing MAT on the 865PE board, http://www.msi.com.tw/html/service/techexpress/tech_column/6728/page5.htm
It has two graphs showing SiSoftware Sandra memory benchmarks.
I have a similar configuration as the test bed but I can not achieve more than 3,561MB/s with default BIOS settings ie no MAT or DOC and using spd on alledgedly the fastest PC3200 memory money can buy the Corsair Twinx PC3200LL.
I am using dual channel with matched set of memory boards.
What gives? I note that the test bed uses PC3500 memory but if the clock rate is the same (400Mhz) no appreciable difference should be shown (bar low latency settings mine 2-3-3-6).
Any ideas on how to get the bandwidth up on this board? Or do I have a problem?

Quote
Originally posted by Neo 2
My memory is running in the 9000\'s. I\'m confused how is mine so high and you guys so low?
Care to post a screenshot? I think that 9,000 is not possible. People in the Asus boards are scoring in the 6,000+ ranges and they are overclocked like crazy.
http://www.asusboards.com/forums/showindex.php?s=79160be2a73b129346e560436a011d5a&threadid=40698&perpage=15&pagenumber=1
Are you sure it's the Memory Bandwidth that you selected? I remember from another thread your version of Sisoft Sandra does not have the PAT option displayed. Download the latest Sandra:
http://www.sisoftware.net/index.html?dir=dload&location=sware_dl_x86&langx=en&a=

Bandwidth limit in ASA 5505

Hello,
I am using ASA 5505 as a transparent firewall. I have assigned ethernet 0/0 as outside interface and ethernet0/1-7 as inside interface. There are 3 departments in office. So, i connected ethernet 0/1 to Dept A, ethernet 0/2 to Dept B and ethernet 0/3 to Dept C.
Now, I want to limit bandwidth to each department, e.g, 1 Mbps download/upload to Dept A, 512 kbps download/upload to Dept B and 512 kbps download/upload to Dept C.
So, how can i do this in ASA 5505...? Please help me doing this configuration.
Your help will be much appreciable.
Thanks,

Hello Robin,
When you talk about policing on the input direction you have to be aware that the traffic already hit your interface, So this is why you are still seeing a higher rate,
Different than from output direction where the traffic has not been send to the interface TX,
Regards,
Julio Carvajal

ASA 5505 - Outside Outbound Bandwidth Issue

ZyXel DSL modem (10MB download and 768Kbps or so upload)
DSL modem is operating in bridge mode
Cisco ASA 5505 in routed mode with ten users behind the ASA. Nothing fancy about the ASA setup.
Each user relies on their own FirePass or Cisco VPN client (outbound, no configuration required in the ASA) continously from 8am to 5pm. Outlook and light application usage over the VPN only.
On Friday, 05/17/13, the outbound connections were working well. Latency was good throughout the day (less than 40ms to Google). On the outside interface, output bandwidth was less than 500Kbps (much less for large portions of the day!). Three users were using streaming Internet radio.
On Monday, 05/20/13, the outbound connections were working poorly. Latency was bad (170ms and higher to Google). On the outside interface, output bandwidth was remaining steady throughout the day between 800Kbps and 850Kbps. Occasionally, the outside output bandwidth would drop to 40Kbps, then 600Kbps and then back to 800Kbps or so. No user on Monday was uploading any large files, no cloud backup or anything of the sort. No users were listening to Internet radio.
On Monday afternoon, I shut down five client machines and the outside output bandwidth was still around 800Kbps.
On Monday evening, I stopped by the office after each user had left the building and checked the outside interface output bandwidth and it was between 0Kbps and 45Kbps (virtually no load). I verified that all machines were powered on, but the VPN clients were disconnected.
On Friday and Monday, for the outside interface, the input bandwidth was between 200Kbps and 500Kbps with occasional higher spikes when users downloaded something.
What could cause the difference between Friday and Monday? Is the DSL upload simply maxed out? If the DSL upload is maxed out, why did it work well on Friday when I had a greater demand on the connection?
Thank you

Hello Modulus,
Did you take captures on the outside interface or the ASA ( This to check what is leaving the ASA ) as you are using VPN clients traffic will go encrypted so you will not be able to determine what is the traffic used for but at least you might notice some extra-traffic (outside the VPN traffic) as this does not look right or normal,
Regards
Julio

CISCO ASA 5505 bandwidth Controll and split

Dear All,
Below am giving the infrastructure which i like to do please help me.
I Am Using Cisco ASA 5505 VPN Firewall and 6Mbps 1:1 dedicated internet connection.
in Lan Side we have 3 networks one for Internet Users one For VPN Users One for CCTV
i would like to split the 6Mbps bandwidth for these network 3 networks 3x2 each
each network use 2Mbps bandwidth. The VPN and CCTV Users use up to 6:00 pm after that the bandwidth will be free
after the 6:00 pm we need to use the the VPN and CCTV line bandwidth to the internet Users.
Cisco Adaptive Security Appliance Software Version 7.2(4)
Device Manager Version 5.2(4)
Compiled on Sun 06-Apr-08 13:39 by builders
System image file is "disk0:/asa724-k8.bin"
so please help me with suitable configuration for my purpose./please tell me which device will support for this/what is have to do for this.
Thanks
Lalu R.S

There's not much of that sort of functionality built into the ASA 5505 entry level firewall. To do that sort of thing in the firewall, you would have to move up to one of the newer 5500-X series with next generation firewall features and build a policy using Application Visibility and Control (AVC).
You can do some crude controls with QoS - the configuration guide chapter on doing that is here.

How to get bandwidth / internet speed in my application ?

Hi,
I am using iPad 3 and ios 5.1
I want to know the bandwidth used by my application (or the internet speed) and display it , as my application deals with downloading of images.
Please guide me ......
Thanks

Thanks for the reply ...
Is there any api or third party library ,we can directly use for finding bandwidth info.
Thanks

I am using a Hughes Satellite and I am having a problem with using all my bandwidth without even using my computer. Is there a way to shut things off that I don't need running all the time in the background.

I am using Hughes satellie for my internet provider. I am having a problem using all my bandwidth each day. Is there a way from using this bandwidth. I am using even when I am not using my computer. Is there a way to turn off things that are running in the background.

It depends a lot on what you have installed and what apps you run. Here's a suggestion: Get Little Snitch and see what processes are accessing your internet connection.
charlie

How can you make FMS 4.5 stop limiting itself to 20-25 Mbps of bandwidth?

I'm working on an upgrade to an ActionScript 3.0 website, and this upgrade multiplies the number of RTMP connections that are liable to be used at one time for streaming live video and audio (sometimes uploading, but more often downloading). Well, we pretty quickly hit some sort of limit with the performance where, even with a modest number of such connections, latency becomes a very serious issue.
The server's computer's CPU and memory usage isn't going off the deep end, and the FMS server's CPU and memory usage isn't going off the deep end. They don't even seem to be affected that much by this. However in the admin console for the FMS server, it quickly becomes evident it's a bandwidth problem of sorts.
What's strange though is that for a little while, if I keep just adding new connections, the bandwidth usage goes up fairly linearly. Then it peaks. Once it gets to about 20-25 Mbps, it won't go any further.
I've looked around for a way to configure this limit to be a lot higher than it currently is. I haven't been able to find anything. The closest I've come is with the BandwidthCap tags in Application.xml, but those don't really apply; they're just capping the bandwidth for individual connections.
Is there not some way for me to raise the bandwidth limit for the overall server so that we could have a halfway decent number of simultaneous video streaming connections? We are running the FMS server on a computer that meets only about half of the minimum memory requirements, and I am aware that this may be the only real problem here. However I need to know whether this is true before I tell my boss that we need more memory. If there is a chance this is just configurable or something, I need to try that first. If it's basically of a computer resources issue due to not meeting the minimum requirements, I need a way to explain that that's exactly what the problem is. Thanks!
By the way I didn't find a forum specifically for FMS or anything, so I'm not sure if this is the right place for this post.

I'm working on an upgrade to an ActionScript 3.0 website, and this upgrade multiplies the number of RTMP connections that are liable to be used at one time for streaming live video and audio (sometimes uploading, but more often downloading). Well, we pretty quickly hit some sort of limit with the performance where, even with a modest number of such connections, latency becomes a very serious issue.
The server's computer's CPU and memory usage isn't going off the deep end, and the FMS server's CPU and memory usage isn't going off the deep end. They don't even seem to be affected that much by this. However in the admin console for the FMS server, it quickly becomes evident it's a bandwidth problem of sorts.
What's strange though is that for a little while, if I keep just adding new connections, the bandwidth usage goes up fairly linearly. Then it peaks. Once it gets to about 20-25 Mbps, it won't go any further.
I've looked around for a way to configure this limit to be a lot higher than it currently is. I haven't been able to find anything. The closest I've come is with the BandwidthCap tags in Application.xml, but those don't really apply; they're just capping the bandwidth for individual connections.
Is there not some way for me to raise the bandwidth limit for the overall server so that we could have a halfway decent number of simultaneous video streaming connections? We are running the FMS server on a computer that meets only about half of the minimum memory requirements, and I am aware that this may be the only real problem here. However I need to know whether this is true before I tell my boss that we need more memory. If there is a chance this is just configurable or something, I need to try that first. If it's basically of a computer resources issue due to not meeting the minimum requirements, I need a way to explain that that's exactly what the problem is. Thanks!
By the way I didn't find a forum specifically for FMS or anything, so I'm not sure if this is the right place for this post.

How to set up a QOS on 3750 switch to limit outbound bandwidth on a server ?

Hi,
I have three LAN ports on a VM server. I want to limit a VM guest (guest server) outbound bandwidth to 3750 swith .
How do I do it ? I want to apply QoS on the switch.
thanks

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Posting
If you're looking to limit bandwidth FROM your server, you can use an ingress policy on the server's interface and police selectively. For example, if your specific VM has its own IP address, you could police inbound (from the server) traffic matching that IP.

We got a new Apple TV for Christmas and it works wonderful. However, my question is this. We are on a satelitte internet system and our bandwidth is limited. Can anyone tell me what effect it will have on using up my 10 megs of bandwidth?

We got a new Apple TV for Christmas and it works wonderful. However, my question is this. We are on a satelitte internet system and our bandwidth is limited. Can anyone tell me what effect it will have on using up my 10 megs of bandwidth? If I run over the 10 mgs, the service either slows way down until it is reset on the first of the next month or I have to purchase additional bandwidth and it can get expensive.
Any information would be greatly appreciated.

If you only have a 10MB limit on the Internet connection you might as well not have Internet access and certainly should not attempt to stream anything.
If the limit is 10GB, then you will need to be careful with streaming as most video is 1-3GB for a one hour show.

How can i calculate the bandwidth usage of my Azure subscription?

Hi,
I know currently there is no API which provide bandwidth usage details. Is there any other way to find out my subscription's bandwidth usage?
Thank you!

Hi,
Please have a look at below thread.
#http://stackoverflow.com/questions/4590682/how-to-measure-windows-azure-bandwidth-usage-programmatically
Here is a snippet.
The Azure SDK doesn't provide any billing or consumption information programatically. As lgorek stated, you can approximate usage with IIS And WCF performance counters.And you'll also be able to use your own logging to track traffic from different users.
However, you won't be able to track bandwidth consumed when users download content from blob storage. Well, you could, but only if all of your blobs were private and you streamed their content through your web application instead of direct links on your web
pages .
Best Regards,
Jambor
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SMTP chewing up bandwidth like crazy! Please help!

I've got a crazy problem with a client's server. First, it's an xServe running 10.4.11 with all software updates. It's been in service as a WWW, Mail, FileMaker, FTP, AFP & Windows file server for several years now. Up until the other day, the machine ran without too many glitches.
The other day, users started complaining that the Internet was really slow. After looking into it, I was able to conclude that SMTP was bogging down the connection. With SMTP off, repeated speed test resulted in about 6 Mbps consistently. When SMTP was fired back up, our speed test results would drop to 300 Kbps or less!!! If my math is correct, that means that SMTP alone was using more than 95% of our 6 Mbps of bandwidth!!!
I found that if I stopped Mail service using Server Admin -- or if I issue "sudo killall smtp", the connection speed would go back up. Then over the course of an hour or so, enough SMTP daemons launch and eventually bog down the connection again.
SMTP relay is OFF and I've confirmed that the server cannot be used as a relay. I've also confirmed it's not another machine on the network -- I literally unplugged the rest of the network so it was just me, my server, my router and my cable modem.
I booted the server from my service drive and examined the hard disks with Disk Utility and then DiskWarrior. I found and repaired only a couple of very minor problems. I also ran repair permissions on the boot volume. I have tried turning off mail service and creating a new, fresh IMAP database and mail store just to eliminate those as a cause. I tried removing the blacklist servers from the config, but that had no effect either.
When I look at the logs, nothing jumps out at me. Maybe because I'm not accustomed to looking at mail logs. Again, this problem is "all-of-the-sudden". Over the past several years, I would regularly connect to this server over the Internet for screen control with Remote Desktop and would get reasonably smooth performance. Now, SMTP has the Internet connection so jammed that I can barely connect with Remote Desktop (unless I kill off the SMTP processes first).
Below, I've included the postfix config files (/etc/postfix/main.cf & /etc/postfix/master.cf) AND the last 50 entries in the mail.log file. Hopefully I've answered most questions and made it clear that this problem is extreme and all-of-the-sudden. NOTE: I've changed my client's domain to 'mydomain.com' to protect their privacy -- But i've altered no other information.
Any suggestions??? I am at a total loss! If I install Mac OS X server, I create a lot of work for myself and the only reason I'm thinking of reinstalling is because I DON'T KNOW WHAT ELSE TO DO!!!
*/etc/postfix/main.cf*
queue_directory = /private/var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
myhostname = mail.mydomain.com
mydomain = mydomain.com
unknown_local_recipient_reject_code = 550
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix/examples
readme_directory = /usr/share/doc/postfix
inet_interfaces = all
mynetworks_style = host
mydomain_fallback = localhost
myhostname = mail.mydomain.com
mailbox_transport = cyrus
enable_server_options = yes
smtpd_sasl_auth_enable = yes
smtpd_use_pw_server = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination,permit
smtpd_pw_server_security_options = login,plain
mynetworks = 127.0.0.1/32,10.0.0.0/24
message_size_limit = 10485760
content_filter = smtp-amavis:[127.0.0.1]:10024
mydestination = $myhostname,localhost.$mydomain,server.mydomain.com,mail.mydomain.com,mydomain. com
relayhost =
virtual_transport = virtual
virtual_mailbox_domains =
owner_request_special = no
recipient_delimiter = +
alias_maps = hash:/etc/aliases
smtpd_client_restrictions = permit_mynetworks permit
maps_rbl_domains =
*/etc/postfix/master.cf*
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
smtp inet n - n - - smtpd
#submission inet n - n - - smtpd
# -o smtpd_etrn_restrictions=reject
#smtps inet n - n - - smtpd
# -o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
#submission inet n - n - - smtpd
# -o smtpd_etrn_restrictions=reject
# -o smtpd_enforce_tls=yes -o smtpd_sasl_auth_enable=yes
#628 inet n - n - - qmqpd
pickup fifo n - n 60 1 pickup
cleanup unix n - n - 0 cleanup
qmgr fifo n - n 300 1 qmgr
#qmgr fifo n - n - 1 nqmgr
#tlsmgr fifo - - n - 1 tlsmgr
rewrite unix - - n - - trivial-rewrite
bounce unix - - n - 0 bounce
defer unix - - n - 0 bounce
trace unix - - n - 0 bounce
verify unix - - n - 1 verify
flush unix n - n 1000? 0 flush
proxymap unix - - n - - proxymap
smtp unix - - n - - smtp
relay unix - - n - - smtp
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq unix n - n - - showq
error unix - - n - - error
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - n - - lmtp
anvil unix - - n - 1 anvil
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
# maildrop. See the Postfix MAILDROP_README file for details.
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
# The Cyrus deliver program has changed incompatibly, multiple times.
old-cyrus unix - n n - - pipe
flags=R user=cyrusimap argv=/cyrus/bin/deliver -e -m ${extension} ${user}
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
cyrus unix - n n - 10 pipe
user=cyrusimap argv=/usr/bin/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=foo argv=/usr/local/sbin/bsmtp -f $sender $nexthop $recipient127.0.0.1:10025 inet n - y - - smtpd
-o content_filter=
-o local_recipient_maps=
-o relay_recipient_maps=
-o smtpd_restriction_classes=
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o smtpd_enforce_tls=no
-o strict_rfc821_envelopes=yes
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
-o receive_override_options=no_header_body_checks
smtp-amavis unix - - y - 2 smtp
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o disable_dns_lookups=yes
127.0.0.1:10025 inet n - y - - smtpd
-o content_filter=
-o local_recipient_maps=
-o relay_recipient_maps=
-o smtpd_restriction_classes=
-o smtpd_client_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o mynetworks=127.0.0.0/8
-o smtpd_enforce_tls=no
-o strict_rfc821_envelopes=yes
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
-o receive_override_options=no_header_body_checks
*MAIL.LOG* (last 50 entries)
Dec 6 13:44:44 server postfix/smtpd[20567]: NOQUEUE: reject: RCPT from unknown[87.203.98.69]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<a-93bf88c8a27b4>
Dec 6 13:44:45 server postfix/smtpd[20567]: disconnect from unknown[87.203.98.69]
Dec 6 13:44:46 server postfix/smtpd[19975]: warning: 201.79.139.138: hostname 20179139138.user.veloxzone.com.br verification failed: Host not found
Dec 6 13:44:46 server postfix/smtpd[19975]: connect from unknown[201.79.139.138]
Dec 6 13:44:46 server postfix/smtpd[19599]: connect from 83-221-93-216.dynamic.primacom.net[83.221.93.216]
Dec 6 13:44:46 server postfix/smtpd[20568]: disconnect from unknown[86.55.5.226]
Dec 6 13:44:46 server postfix/smtpd[19599]: NOQUEUE: reject: RCPT from 83-221-93-216.dynamic.primacom.net[83.221.93.216]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<83-221-93-216.dynamic.primacom.net>
Dec 6 13:44:47 server postfix/smtpd[19975]: NOQUEUE: reject: RCPT from unknown[201.79.139.138]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<20179139138.user.veloxzone.com.br>
Dec 6 13:44:47 server postfix/smtpd[19599]: disconnect from 83-221-93-216.dynamic.primacom.net[83.221.93.216]
Dec 6 13:44:47 server postfix/smtpd[19975]: disconnect from unknown[201.79.139.138]
Dec 6 13:44:48 server postfix/smtpd[20647]: connect from 82-43-177-165.cable.ubr06.nmal.blueyonder.co.uk[82.43.177.165]
Dec 6 13:44:48 server postfix/smtpd[20647]: NOQUEUE: reject: RCPT from 82-43-177-165.cable.ubr06.nmal.blueyonder.co.uk[82.43.177.165]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<82-43-177-165.cable.ubr06.nmal.blueyonder.co.uk>
Dec 6 13:44:49 server postfix/smtpd[20647]: disconnect from 82-43-177-165.cable.ubr06.nmal.blueyonder.co.uk[82.43.177.165]
Dec 6 13:44:50 server postfix/smtpd[19955]: connect from i577a48a1.versanet.de[87.122.72.161]
Dec 6 13:44:50 server postfix/smtpd[20558]: connect from cm-85-152-128-251.telecable.es[85.152.128.251]
Dec 6 13:44:51 server postfix/smtpd[19955]: NOQUEUE: reject: RCPT from i577a48a1.versanet.de[87.122.72.161]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<i577A48A1.versanet.de>
Dec 6 13:44:51 server postfix/smtpd[19955]: disconnect from i577a48a1.versanet.de[87.122.72.161]
Dec 6 13:44:51 server postfix/smtpd[20558]: NOQUEUE: reject: RCPT from cm-85-152-128-251.telecable.es[85.152.128.251]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<cm-85-152-128-251.telecable.es>
Dec 6 13:44:51 server postfix/smtpd[20558]: disconnect from cm-85-152-128-251.telecable.es[85.152.128.251]
Dec 6 13:44:51 server postfix/smtpd[19984]: connect from i577b3c95.versanet.de[87.123.60.149]
Dec 6 13:44:52 server postfix/smtpd[20567]: connect from 200150012106.static.corp.wayinternet.com.br[200.150.12.106]
Dec 6 13:44:52 server postfix/smtpd[19984]: NOQUEUE: reject: RCPT from i577b3c95.versanet.de[87.123.60.149]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<i577B2F9F.versanet.de>
Dec 6 13:44:52 server postfix/smtpd[19984]: disconnect from i577b3c95.versanet.de[87.123.60.149]
Dec 6 13:44:53 server postfix/smtpd[20567]: NOQUEUE: reject: RCPT from 200150012106.static.corp.wayinternet.com.br[200.150.12.106]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<200150012106.static.corp.wayinternet.com.br>
Dec 6 13:44:53 server postfix/smtpd[20567]: disconnect from 200150012106.static.corp.wayinternet.com.br[200.150.12.106]
Dec 6 13:44:55 server postfix/smtpd[20645]: lost connection after EHLO from bxg170.internetdsl.tpnet.pl[83.18.240.170]
Dec 6 13:44:55 server postfix/smtpd[20645]: disconnect from bxg170.internetdsl.tpnet.pl[83.18.240.170]
Dec 6 13:44:55 server postfix/smtpd[20568]: connect from adsl-ull-76-151.41-151.net24.it[151.41.151.76]
Dec 6 13:44:56 server postfix/smtpd[19599]: connect from bzq-84-108-155-86.cablep.bezeqint.net[84.108.155.86]
Dec 6 13:44:56 server postfix/smtpd[19975]: connect from 77-253-243-29.adsl.inetia.pl[77.253.243.29]
Dec 6 13:44:56 server postfix/smtpd[20568]: NOQUEUE: reject: RCPT from adsl-ull-76-151.41-151.net24.it[151.41.151.76]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<adsl-ull-31-139.41-151.net24.it>
Dec 6 13:44:56 server postfix/smtpd[19599]: NOQUEUE: reject: RCPT from bzq-84-108-155-86.cablep.bezeqint.net[84.108.155.86]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<bzq-84-108-155-86.cablep.bezeqint.net>
Dec 6 13:44:56 server postfix/smtpd[19599]: disconnect from bzq-84-108-155-86.cablep.bezeqint.net[84.108.155.86]
Dec 6 13:44:56 server postfix/smtpd[20568]: disconnect from adsl-ull-76-151.41-151.net24.it[151.41.151.76]
Dec 6 13:44:57 server postfix/smtpd[20646]: connect from host217-22-dynamic.27-79-r.retail.telecomitalia.it[79.27.22.217]
Dec 6 13:44:57 server postfix/smtpd[20646]: lost connection after CONNECT from host217-22-dynamic.27-79-r.retail.telecomitalia.it[79.27.22.217]
Dec 6 13:44:57 server postfix/smtpd[20646]: disconnect from host217-22-dynamic.27-79-r.retail.telecomitalia.it[79.27.22.217]
Dec 6 13:44:57 server postfix/smtpd[19975]: NOQUEUE: reject: RCPT from 77-253-243-29.adsl.inetia.pl[77.253.243.29]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<77-253-243-29.adsl.inetia.pl>
Dec 6 13:44:58 server postfix/smtpd[20647]: connect from unknown[72.54.61.253]
Dec 6 13:44:58 server postfix/smtpd[20647]: NOQUEUE: reject: RCPT from unknown[72.54.61.253]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<[72.54.61.253]>
Dec 6 13:44:58 server postfix/smtpd[20647]: disconnect from unknown[72.54.61.253]
Dec 6 13:44:58 server postfix/smtpd[19975]: disconnect from 77-253-243-29.adsl.inetia.pl[77.253.243.29]
Dec 6 13:44:58 server postfix/smtpd[19955]: connect from p4fced3c6.dip.t-dialin.net[79.206.211.198]
Dec 6 13:44:59 server postfix/smtpd[19955]: NOQUEUE: reject: RCPT from p4fced3c6.dip.t-dialin.net[79.206.211.198]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<p4FCED3C6.dip.t-dialin.net>
Dec 6 13:44:59 server postfix/smtpd[19955]: disconnect from p4fced3c6.dip.t-dialin.net[79.206.211.198]
Dec 6 13:45:00 server postfix/smtpd[19984]: connect from bxg170.internetdsl.tpnet.pl[83.18.240.170]
Dec 6 13:45:00 server postfix/smtpd[20558]: connect from bl7-9-222.dsl.telepac.pt[85.240.9.222]
Dec 6 13:45:01 server postfix/smtpd[20558]: NOQUEUE: reject: RCPT from bl7-9-222.dsl.telepac.pt[85.240.9.222]: 550 <[email protected]>: Recipient address rejected: User unknown in local recipient table; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<bl5-55-154.dsl.telepac.pt>
Dec 6 13:45:01 server postfix/smtpd[20558]: disconnect from bl7-9-222.dsl.telepac.pt[85.240.9.222]
Dec 6 13:45:01 server postfix/smtpd[20567]: connect from unknown[212.23.103.33]
*ps -aux | grep "smtp"*
postfix 20565 0.0 -0.1 29976 1368 ?? S 1:39PM 0:00.23 smtpd -n 127.0.0.1:10025 -t inet -u -c -o content_filter -o local_recipient_maps -o relay_recipient_maps -o smtpd_restriction_classes -o smtpd_client_restrictions -o s
postfix 20645 0.0 -0.1 29976 1756 ?? S 1:43PM 0:00.24 smtpd -n smtp -t inet -u
postfix 20647 0.0 -0.1 29976 1836 ?? S 1:43PM 0:00.23 smtpd -n smtp -t inet -u
postfix 20682 0.0 -0.0 27468 624 ?? S 1:45PM 0:00.09 smtp -n smtp-amavis -t unix -u -c -o smtp_data_done_timeout 1200 -o smtp_send_xforward_command yes
postfix 20737 0.0 -0.1 29976 1836 ?? S 1:47PM 0:00.24 smtpd -n smtp -t inet -u
postfix 20806 0.0 -0.1 29976 1756 ?? S 1:48PM 0:00.22 smtpd -n smtp -t inet -u
postfix 20860 0.0 -0.1 29976 1756 ?? S 1:50PM 0:00.16 smtpd -n smtp -t inet -u
postfix 20861 0.0 -0.1 29976 1724 ?? S 1:50PM 0:00.10 smtpd -n smtp -t inet -u
postfix 20864 0.0 -0.1 29976 1808 ?? S 1:50PM 0:00.11 smtpd -n smtp -t inet -u
postfix 20912 0.0 -0.1 29976 1740 ?? S 1:52PM 0:00.12 smtpd -n smtp -t inet -u
postfix 20914 0.0 -0.1 29976 1732 ?? S 1:52PM 0:00.11 smtpd -n smtp -t inet -u
postfix 21009 0.0 -0.0 27468 812 ?? S 1:56PM 0:00.02 smtp -t unix -u
postfix 21033 0.0 -0.1 29976 1736 ?? S 1:57PM 0:00.03 smtpd -n smtp -t inet -u
postfix 21034 0.0 -0.1 29976 1740 ?? S 1:57PM 0:00.04 smtpd -n smtp -t inet -u
admin 21036 0.0 -0.0 27376 420 p1 S+ 1:57PM 0:00.00 grep smtp

Further investigation shows that after killing all the smtp (or otherwise restarting it) it works fine for a while then goes nuts launching SMTP and SMTPD processes.
So if the connection is bogged down and SMTP is out of control, I issue:
sudo killall "smtp"
and the connection speed goes back to normal for a while and the output of
ps -aux | grep "smtp"
is as follows:
[server:~] admin% ps -aux | grep "smtp"
postfix 3219 0.2 -0.1 29856 1728 ?? S 6:55PM 0:00.11 smtpd -n smtp -t inet -u
postfix 457 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.31 smtpd -n smtp -t inet -u
postfix 467 0.0 -0.2 29856 4700 ?? S 6:04PM 0:00.28 smtpd -n smtp -t inet -u
postfix 471 0.0 -0.2 29856 4700 ?? S 6:04PM 0:00.30 smtpd -n smtp -t inet -u
postfix 476 0.0 -0.2 29856 4704 ?? S 6:04PM 0:00.27 smtpd -n smtp -t inet -u
postfix 479 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.28 smtpd -n smtp -t inet -u
postfix 480 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.30 smtpd -n smtp -t inet -u
postfix 481 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.32 smtpd -n smtp -t inet -u
postfix 2557 0.0 -0.1 29856 1744 ?? S 6:41PM 0:00.10 smtpd -n smtp -t inet -u
postfix 2561 0.0 -0.1 29856 1760 ?? S 6:42PM 0:00.14 smtpd -n smtp -t inet -u
postfix 2610 0.0 -0.1 29856 1728 ?? S 6:43PM 0:00.07 smtpd -n smtp -t inet -u
postfix 3077 0.0 -0.1 29856 1748 ?? S 6:53PM 0:00.07 smtpd -n smtp -t inet -u
postfix 3462 0.0 -0.1 29856 1336 ?? S 7:00PM 0:00.04 smtpd -n 127.0.0.1:10025 -t inet -u -c -o content_filter -o localrecipientmaps -o relayrecipientmaps -o smtpdrestrictionclasses -o smtpdclientrestrictions -o s
postfix 3533 0.0 -0.1 29856 1740 ?? S 7:02PM 0:00.03 smtpd -n smtp -t inet -u
postfix 3539 0.0 -0.1 29856 1752 ?? S 7:02PM 0:00.03 smtpd -n smtp -t inet -u
postfix 3593 0.0 -0.0 27468 624 ?? S 7:03PM 0:00.01 smtp -n smtp-amavis -t unix -u -c -o smtpdata_donetimeout 1200 -o smtpsend_xforwardcommand yes
admin 3603 0.0 -0.0 27376 420 p1 S+ 7:03PM 0:00.00 grep smtp
[server:~] admin%
... but then after a while
ps -aux | grep "smtp"
yields:
postfix 3462 0.5 -0.1 29856 1328 ?? S 7:00PM 0:00.03 smtpd -n 127.0.0.1:10025 -t inet -u -c -o content_filter -o localrecipientmaps -o relayrecipientmaps -o smtpdrestrictionclasses -o smtpdclientrestrictions -o s
postfix 388 0.0 -0.2 29856 4700 ?? S 6:04PM 0:00.33 smtpd -n smtp -t inet -u
postfix 457 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.30 smtpd -n smtp -t inet -u
postfix 458 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.33 smtpd -n smtp -t inet -u
postfix 467 0.0 -0.2 29856 4700 ?? S 6:04PM 0:00.27 smtpd -n smtp -t inet -u
postfix 471 0.0 -0.2 29856 4704 ?? S 6:04PM 0:00.29 smtpd -n smtp -t inet -u
postfix 476 0.0 -0.2 29856 4704 ?? S 6:04PM 0:00.27 smtpd -n smtp -t inet -u
postfix 477 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.31 smtpd -n smtp -t inet -u
postfix 479 0.0 -0.2 29856 4712 ?? S 6:04PM 0:00.26 smtpd -n smtp -t inet -u
postfix 480 0.0 -0.2 29856 4704 ?? S 6:04PM 0:00.28 smtpd -n smtp -t inet -u
postfix 481 0.0 -0.2 29856 4708 ?? S 6:04PM 0:00.31 smtpd -n smtp -t inet -u
postfix 2249 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2250 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2251 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.04 smtp -t unix -u
postfix 2253 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2254 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2257 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.10 smtp -t unix -u
postfix 2259 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.08 smtp -t unix -u
postfix 2261 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.04 smtp -t unix -u
postfix 2263 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2264 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2265 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2266 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2269 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2270 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.04 smtp -t unix -u
postfix 2275 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2276 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.04 smtp -t unix -u
postfix 2279 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.08 smtp -t unix -u
postfix 2280 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2281 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.08 smtp -t unix -u
postfix 2283 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2284 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.03 smtp -t unix -u
postfix 2286 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2287 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2289 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2290 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2291 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2292 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2296 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2297 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2299 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2300 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.12 smtp -t unix -u
postfix 2301 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2304 0.0 -0.0 27468 812 ?? S 6:37PM 0:00.12 smtp -t unix -u
postfix 2305 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2307 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.11 smtp -t unix -u
postfix 2308 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2309 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2310 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.08 smtp -t unix -u
postfix 2311 0.0 -0.0 27468 812 ?? S 6:37PM 0:00.10 smtp -t unix -u
postfix 2315 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2316 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2317 0.0 -0.0 27468 796 ?? S 6:37PM 0:00.05 smtp -t unix -u
postfix 2320 0.0 -0.0 27468 788 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2321 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2322 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2323 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2324 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2325 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2329 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2330 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2331 0.0 -0.0 27468 792 ?? S 6:37PM 0:00.06 smtp -t unix -u
postfix 2333 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.10 smtp -t unix -u
postfix 2340 0.0 -0.0 27468 800 ?? S 6:37PM 0:00.11 smtp -t unix -u
postfix 2343 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.08 smtp -t unix -u
postfix 2344 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.14 smtp -t unix -u
postfix 2345 0.0 -0.0 27468 804 ?? S 6:37PM 0:00.07 smtp -t unix -u
postfix 2347 0.0 -0.0 27468 808 ?? S 6:37PM 0:00.09 smtp -t unix -u
postfix 2557 0.0 -0.1 29856 1736 ?? S 6:41PM 0:00.09 smtpd -n smtp -t inet -u
postfix 2561 0.0 -0.1 29856 1752 ?? S 6:42PM 0:00.12 smtpd -n smtp -t inet -u
postfix 2610 0.0 -0.1 29856 1720 ?? S 6:43PM 0:00.07 smtpd -n smtp -t inet -u
postfix 3077 0.0 -0.1 29856 1728 ?? S 6:53PM 0:00.05 smtpd -n smtp -t inet -u
postfix 3102 0.0 -0.0 27468 808 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3103 0.0 -0.0 27468 804 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3104 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3105 0.0 -0.0 27468 804 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3106 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3107 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3108 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3109 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3110 0.0 -0.0 27468 816 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3111 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3112 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3113 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3114 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.04 smtp -t unix -u
postfix 3115 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3116 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3117 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3118 0.0 -0.0 27468 804 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3119 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3120 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3121 0.0 -0.0 27468 808 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3122 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3123 0.0 -0.0 27468 812 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3124 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3125 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3126 0.0 -0.0 27468 812 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3127 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3128 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3129 0.0 -0.0 27468 816 ?? S 6:53PM 0:00.04 smtp -t unix -u
postfix 3130 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3131 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3132 0.0 -0.0 27468 820 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3133 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3134 0.0 -0.0 27468 816 ?? S 6:53PM 0:00.04 smtp -t unix -u
postfix 3135 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3136 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3137 0.0 -0.0 27468 808 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3138 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.02 smtp -t unix -u
postfix 3139 0.0 -0.0 27468 812 ?? S 6:53PM 0:00.04 smtp -t unix -u
postfix 3140 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3141 0.0 -0.0 27468 808 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3142 0.0 -0.0 27468 796 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3143 0.0 -0.0 27468 800 ?? S 6:53PM 0:00.04 smtp -t unix -u
postfix 3144 0.0 -0.0 27468 808 ?? S 6:53PM 0:00.03 smtp -t unix -u
postfix 3219 0.0 -0.1 29856 1724 ?? S 6:55PM 0:00.05 smtpd -n smtp -t inet -u
postfix 3460 0.0 -0.0 27468 620 ?? S 7:00PM 0:00.01 smtp -n smtp-amavis -t unix -u -c -o smtpdata_donetimeout 1200 -o smtpsend_xforwardcommand yes
admin 3468 0.0 -0.0 27376 420 p1 S+ 7:00PM 0:00.00 grep smtp
... and it's when this is going on that the internet connection is bogged down.

How do i extend the bandwidth of my system

The control problem I am having is extending the bandwidth of a force control system. The system is used to apply mechanical load to bone to facilitate research into Osteoporosis. The following concisely describes the system and the different things I have tried to solve the problem,. I imagine it is quite lengthy compared to the usual questions but any advice you have to offer to a Mechanical engineer would be much appreciated.
System Description:
I am using Labview (with Flex motion) to program the NI 7344 motion control servo board (PID update rate of 62.4 micro-seconds). This output signal is then amplified by the MID 7654 power amplifier, supplying current to a Voice coil (this can be considered as a Linear DC motor with a bandwidth of 40Hz). This applies the force to a bone sample. Feedback is then provided by a load cell and connected to the ADC feedback channel of the servo board. (For full specs of all mentioned components please refer to the web links which are listed at the end of this email!)
Problem description:
After optimally tuning the PID characteristics and defining the amplitude and pre-load, I can successfully control a continuous, sinusoidally varying force (frequency 1Hz), however when I try to increase the frequency to 10Hz, the amplitude of the output waveform is marginally reduced�i.e. there is attenuation. I know that the bone sample is not viscoelastic enough to act as a low pass filter. The bandwidth of the Voice coil is not a limiting factor either, so�..
How do I extend the bandwidth of this system?
The following Paragraph describes some of the things I have tried, which have had some or no influence. Being a mechanical engineer I would be grateful for any expert advice.
(Note all results have been verified with an oscilloscope where applicable)
Influential Factors:
1) Method of programming.
To generate the wave form a series of points describing one period are written to a circular buffer on the servo board. The points are executed in 10 milli-second intervals and are splined through using a cubic spline algorithm (hence a period described by 100 points gives us a frequency of 1Hz and a 10 point wave gives us 10Hz). All this happens on the servo board in real time. I am confident that although the integrity of the sine wave is reduced at 10 Hz the amplitude is still described within the 10 points and so is not the reason for attenuation. However this does limit the maximum frequency achievable. (I would say the max frequency is about 20Hz)
2) Redefining the resolution of the of the ADC Feedback
The 12 bit ADC feedback channel is scanned at a rate of 50 micro seconds (faster than the loop update rate which is 62.4 micro-seconds). Initially the voltage range was specified at -/+ 10 V giving 20/(2^12) Volts per significant bit, however I noticed that when I increased the resolution to the max possible by changing the range to 0-5 V (giving 5/(2^12) volts per significant bit), the amount of attenuation was reduced, however there was still some attenuation there. This begs another question why would this factor improve the frequency response???
3) PID characteristics
The system gives an optimum step response when using only a pure integral term and setting Kp= 0, Kd= 0. It seems as though the fastest step response is limited to about 6 milli-seconds. The system is fine tuned and any slight increase in the integral term results in immediate instability. Therefore there is no scope to improve the system bandwidth by altering the PID characteristics.
Can you offer me any expert advice?
Considering this information, what would you advise? Do I need a board with a faster loop update rate ?, I have considered using Labview Real Time, which offers a board with a 26 KHz update rate as apposed to the 16Hz (62.4 micro-seconds) provided by the current board). Do I need to use different control algorithms as apposed to PID, if so which ones???
Any help or advice you have to offer would be much appreciated and could help in the battle against osteoporosis. Should you require more information or would like to speak to me send me an email and I can answer any further questions or give you a ring.
Regards Duncan Webster
Email: [email protected]
Product specs:
Servo board:
http://www.ni.com/pdf/products/us/4mo636-637.pdf
Power amp
http://www.ni.com/pdf/products/us/4mo642-643.pdf

Hi Duncan,
i'm sorry that this answer took this long, but i think a constructive answer which takes a long time is better than a useless answer in a short time....
For the following thought-provoking impulses we have to consider the signal-change when increasing the frequency. The points which describe the signal get streched over the period. Increasing the frequency enlarges the distance between the points.
a) The spline algorithm could be the problem here hence the signal does not correctly pass through the points anymore with increased frequency. Therefor the amplitude decreases with increased frequency. Perharps another kind of spline algorithm can be helpful.
b) Another point can be the control deviation. Since a feedback control system needs a devia
tion for the control, the deviation gets larger when increasing the frequency of the controlled loop. Maybe the control loop has to set the desired value when already getting to a new point. So the signal could get "washy" and the maximum amplitude is reduced.
In this case, the "Velocity Feedforward"-parameter could be of use. This parameter is to use with caution for it can have similar effects like a too high chosen integral term.
c) You can try to set the 7344 to circular contour. Therefor use 2 axis where you use the second axis as dummy (open step). There is a major disadvantage in this setup: since you use 2 axes at the same time, the 7344 can update each axis only with 125 microseconds. But perharps this is sufficient. Either way the parameter of the control loop have to be adapted (integral term reduced).
d) If the 125 microseconds describend in c) is insufficient, you can try to test it with a 7352. The 7352 can handle 2 axis at a time with a update rate of 62.5 microse
conds for each axis.
I hope this answer helps you in solving your rather special issue.
-Norbert
NI Germany
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

Time Capsule Allocating Bandwidth on it's Own?

I've been using my Time Capsule for several months now and I'm convinced that there's some suspicious stuff going on in the background. I first noticed the problem back home in the States where I had pretty high-bandwidth before installing it. After I began using the TC as my router, the internet speeds were noticeably slower, but not enough to cause alarm because my connection was fast enough to begin width.
Then I moved to Africa where I set up the same system. Here, the wireless spectrum is far less crowded than it is in the States so I figured I get better performance out of all my Wifi gear. I'm using the TC as the main router and hub, several airport expresses scattered around the house are connected to it wirelessly, a printer and hard drive connected to the TC for printing and streaming movies wirelessly. Internet is far more expensive here. The connection is only 128kbps split (64 up and 64 down) so any complications are very noticeable. It was obvious right away I was having problems.
So I turned everything that might be using bandwidth from the router completely off, so that it's essentially just my Time Capsule and my laptop and I'm noticing that my internet bandwidth is still being hogged by the TC. I had my local ISP print out a report of my bandwidth usage and it shows that I'm using my entire 64kbps for uploads at ALL TIMES while using my TC as the router.
So to test my theory, I unplugged the TC and plugged the ethernet cable into my laptop. Now I've got my bandwidth back. The same report from the ISP shows that I have the full spectrum free until I begin using the network.
I'm only using the TC as a router, distributing wifi to my Macbook, iPhone, iMac and a PC. I only 'Back up to Time Machine' with an ethernet cable because it's faster and doesn't disturb the network. Even then I only back up one a month or so.
My question is why on earth would the Time Capsule be hogging all this internet bandwidth when it's not even really in use? I have a few tools for measuring the throughput of my Wifi devices (Airport Flow and Airport Utility) and I can see that the bottleneck isn't happening in the signal it's broadcasting. The bottleneck seems to be occurring at the actual input. Somehow the Time Capsule is trying to allocate my bandwidth in ways that I don't want or need it to. Is there a way to stop this?

Because the TC and Mountain Lion is buggy.. 11 days is great.. loads of people have to do it every day.
ML has the network ability of tin cans with wet string.. every now and then the string snaps and you have to rejoin it.. ie reboot everything.

Bandwidth Issue on a Local LAN

OK,
I've been beating my head against the wall with this one. First I will begin with a list of the test equipment.
2 iSight Cameras, 1 Powerbook G4 1.5Ghz, 1 iMac G5 1.8Ghz and a PowerMacG5 Dual 2Ghz.
It all started when I went to connect from my PowerMac to my iMac. I kept getting the Insufficient bandwidth issue. So I thought the problem was the iSight Cameras, so I pulled out my laptop and presto the Powerbook connected both video and audio with no problem to my iMac. Next, I decided to test Powerbook to Powermac and I got the same error. So I thought to myself maybe it is a preference file. I moved my preference folder out of my Library on my Powermac, rebooted and attempted again, still got the same error. So I though again, maybe iChat is corrupted on my PowerMac, I deleted it and grabbed the copy from my Powerbook and placed it on my Powermac. Tried again, same error.
As you can tell by now I am ripping my hair out. All the machines have the same settings for iChat and Quicktime so that is not the problem.
So then there was one more thing, my iMac and Powerbook are both wireless and the Powermac is on my Gigabit LAN. Hmmmm.... so I placed my powerbook on the wire LAN just to make sure that wasn't the issue. Guess What?! The same ERROR!!!!
By now I have no hair left on my head. Can someone please advice what could be happening, what I did not try. I do not think I need to reinstall Tiger on my Powermac, that is a windows thing (when all else fails reformat and install). Both the powerbook and powermac are upgraded the iMac is a clean Tiger install. Please someone help!!!
Thank you,
JC

OK here is where I put my foot in my mouth. I have 2 gateways in my house one for dsl and one for cable. I have both in case one goes down in my house as I work from home. All the machines that were getting dynamic addressing were pointing out to the dsl router (iMAC, POWERBOOK) and the ones with physical address are pointing to the Cable (POWERMAC, PC, SERVER (workign comps)). THis is due to the fact that I didn't want my wife or daughter on using up the faster cable connection. THey are all still in the same network but pointing to different routers. Now I do not know how it affects the video/audio chat of iChat but it does. Even though all machines can see each other, work together, have a TEXT chat together but just see the internet via different routers as all before is local, it appears to cause a problem with the video and audio connections. So Ralph, thank you, you were correct, it had to do with the router. I would love to know how this affected anything since it was the video/audio connection I wanted was local.
JC

Bandwidth...

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