The information is available in Appsnet under the 'Technology' Tab and you would need to look at some of the White Papers - including one with the name 'Nothing but Net' and the Network Performance Presentation.
null

Similar Messages

Hard drive and network performance

Can someone give me the intuitive, if not mathematic, side to where a hard drives performance becomes a bottleneck in network performance?
For example, say a given internal hard drive in a computer has a read/write of 40MB/s = 320Mbps. This is 1/3 the bandwidth of a gigabit ethernet cable, assuming everything works like it should.
So when you are downloading from your big RAID 5 file store on the gigabit network, to your local desktop (the hard drive that read/writes at 320Mbps), how do you ever utilize the full gigabit ethernet connection?
Just seems to me like the drive cache would be constantly full if you are downloading a large video file or such.
So what obvious thing am I missing?
Thanks

The simple answer is that you don't. At least not in this scenario.
As you've correctly surmised, the slower components are going to limit your throughput, but the disk speed is only one of several factors. Network latency, TCP/IP packet overhead and more will all contribute.
So you'll rarely get true gigabit throughput on file transfers. 300-400 mpbs on a gigabit ethernet connection is typical.
Where you can and do get more is on memory-based transfers - data in one systems's RAM (or cache) being copied to another system's RAM (or cache). That's why switches and routers can handle line-speed throughput - they get a packet on one interface and send it out another, never having to think about it again (oversimplified, of course).

Daily and monthly performance view

Hi,
I have problem with the built in performance view of SCVMM 2012 R2 U4.
The environment consist of 5 hyper-v hosts in a cluster configuration.
Problem:
Four of the five hosts does not show network and storage performance counters.
One host show the storage and network performance counters.
This is only in SCVMM GUI. From the powershell I can see the performance counters and history of all the hosts.
The aggregated value of e.g. used memory is not correct in the GUI.
The performance counters of the hosts are working correctly. SCVMM have access to the servers as well and can read all the counters since it's working from the command line. This has to do something with this SQL database. I need to reset the collected performance
data or rebuild the performance tables and stored procedures some how.
This is driving me crazy. Any help is appreciated!

Hi Polaris,
Instead of hard coding the HRS as 8 in PCR please try to read the hours from Info type 0007. Sample PCR is as below.
where EG-1 is intern
Z105-Time type
For permanent employee complete calculation will be based on the IT0008.
Please explain with an example if you still have any queries.
Hope this helps:)
Regards
Rakesh KM

An unknown error occurred while performing a sync operation. Please check your account and network settings, then try again.

hi,
i cannot perform any syncs / back ups (including mobile me) on my imac other than old ipods.
i recieve this message
"An unknown error occurred while performing a sync operation. Please check your account and network settings, then try again".

hi,
i cannot perform any syncs / back ups (including mobile me) on my imac other than old ipods.
i recieve this message
"An unknown error occurred while performing a sync operation. Please check your account and network settings, then try again".

Windows 7 file copy and overall network performance

I have noticed some major problems with network performance when trying to access files stored on our NSS based file servers when using Windows 7 Pro.
Our file servers are OES2 SP1 and SLES 10 SP3. I did not have this type of problem when I was on Windows XP. I am currently using the Novell Client 2 SP1 on Windows 7. I did have the BSOD referring to the nccache.sys file. I read a TID that said to turn off file caching, but since doing that it is painfully slow.
Any help in advance will be greatly appreciated. If I should post this elsewhere please let me know as well. Thanks again.

Originally Posted by mrosen
On 27.01.2011 20:06, dshofkom33 wrote:
>
> Our file servers are OES2 SP1 and SLES 10 SP3.
I sure hope that's incorrect, as OES2SP1 runs on SLES10 SP2, not 3.
Also, you should really be running OES2 SP2 at aleast (SP3 just having
been released).
> I did not have this type
> of problem when I was on Windows XP. I am currently using the Novell
> Client 2 SP1
No IR5?
> on Windows 7. I did have the BSOD referring to the
> nccache.sys file. I read a TID that said to turn off file caching, but
> since doing that it is painfully slow.
Caching doesn't have any noticeable or even measurable performance
impact on more copying of files, as caching doesn't come into play here.
It can only have an effect on repeated activity on the same file, which
fily copying by design isn't.
> Any help in advance will be greatly appreciated. If I should post this
> elsewhere please let me know as well. Thanks again.
This would probably be better suited for the client forums, but you need
to post more information. Being "Painfully slow" isn't a technically
precise nor helpful description.
CU,
Massimo Rosen
Novell Product Support Forum Sysop
No emails please!
Untitled Document
You are correct with our Server installations. Sorry for the mistype.
As far as my client goes. I will try the IR5 client version to see if that is any better.
As far as being "Painfully slow" i mean it was taking hours to install a product from a .ISO hosted on one of our NSS mapped drives. It would take 15 minutes to copy a 3MB file wile the .ISO was installing. It took even longer to try to copy the file down. I had no problems with any of the forementioned when running on Windows XP SP3 with client 4.91 SP5. What other details do you need?

Safari hangs and poor performance in MBPR (Mid 2012)

Safari hangs and poor performance in MBPR (Mid 2012)? OS X 10.10.2 is up to date

Please answer as many of the following questions as you can. You may already have answered some of them. In that case, there's no need to repeat the answers.
Back up all data before making any changes.
Have you restarted your router and your broadband device (if they're separate) since you first noticed the problem? If not, do that now and see whether there's any change.
If your browser is Safari, then from the Safari menu bar, select
Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
and confirm. If the Downloads button (with the icon of a downward-pointing arrow) is showing in the toolbar, click it and then click Clear in the box that appears. The download history will be removed. Any change?
If you're running OS X 10.9 or later, select the Advanced tab in the Preferences window and uncheck the box marked
Stop plug-ins to save power
Any change?
Quit and relaunch the browser. Any change?
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.
Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.
Are any other web browsers installed, and are they the same? What about other Internet applications, such as iTunes and the App Store?
If other browsers and Internet applications are also affected, follow these instructions and test. Any change?
If Parental Controls is active for any user, please turn it off and test. Any change?
If only Safari is affected, launch the Activity Monitor application and enter "web" (without the quotes) in the search box. If a process named "Safari Web Content" is shown in red or is using more than about 5% of a CPU, select it and force it to quit by clicking the X or Quit Process button in the toolbar of the window. There may be more than one such process. Any improvement?
Follow the instructions in this support article. Any change?
Open the iCloud preference pane and uncheck the box marked Photos, if it's checked. Any change?
Are there any other devices on the same network that can browse the Web, and are they affected?
If you can test Safari on another network, is it the same there?
If you connect to your router with Wi-Fi and you can also connect with Ethernet, do that and turn off Wi-Fi. Any difference?

Problem in Server Admin: cpu and network graphs not updated or empty after lion server update

Hi!
Just for archive purpouses because i've already solved that!
After upgrading from OSX Server 10.7 to 10.7.1 my CPU and Network graphs in Server Admin stop being updated.
In 24h the graphs where blank (disk usage graph seem to keep working).
First i read about "what is the application responsible for this"; it's called ServerPerfLog, and you can see if it's running that way:
     # ps ax | grep ServerPerf
If you don't see anything else than your own "grep", that means that no application is running, no data is being collected.
     41324 s000 R+     0:00.00 grep ServerPerf
A positive response for this (meaning that the service is running) should be something like that (2 lines: your grep and the service app itself):
     94   ?? Ss     0:04.71 /usr/libexec/ServerPerfLog
     41344 s000 R+     0:00.00 grep ServerPerf
Later i read about "where is the config file for this service app", and you can find it here:
     /System/Library/LaunchDaemons/com.apple.ServerPerfLog.plist
If you edit this config file, check that the "Key > Disabled" is set to "False"
     # vi /System/Library/LaunchDaemons/com.apple.ServerPerfLog.plist
        <key>Disabled</key>
        <false/>
After that, i try to launch the service that updates this graphs again, by hand, performing the following command:
     # sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.ServerPerfLog.plist
And the service got launch!!! yeeeepa!! i see a first update in graph data.
Also the "ps" query reply that the service was running!!
The bad things came a day after, when i saw that the graphs stop again....
I check if the service was running executing again the "ps" command, and that show me that the service was stopped again; no ServerPerfLog process was running.
But r e l a x, because the process hang because of a permissions problem.
You should know, I run "Repair permissions" within "Disk Utilities" over the running system disk, eeee... voila!
I hope that helps someone to get his fancy graphs back!
Regards,
t

You are God like!!! Wooo hooo! Thanks bud!

8.1 system process spiking cpu, disk, and network utilization.

Hi all,
After the most recent update to 8.1(I believe it was Mon 5/19/2014,) my laptop has been giving control to another program for about half a second, and then returning it to me. If I am typing, nothing comes up during that
moment, the menu bar changes visually, then it quickly reverts. This is more annoying than malicious. After some digging I found that cpu, disk, and network all spike at the same time, about 5 seconds apart. Here's what I've gathered:
Task Manager: Under the process tab, Windows Problem Reporting,(under background processes), pops in and out when the problem occurs. This is EXTREMELY odd as I've disabled the Windows Error Reporting service. Under the performance tab, The spikes are all
concurrent and similar in appearance, as shown on the graphs.
Services: When I *stop* the Windows Error Reporting service I get: "Windows could not stop the Windows Error Reporting service on local computer. The service did not return an error. This could be an internal
Windows error or an internal service error. If the problem persists, contact your system administrator." So I have *disabled* it.
Resource Monitor: I find multiple instances of WerFault.exe using different pids. They are under network activity and tcp connections, all pointed at 157.56.141.101. A quick look-up revealed that this address is registered to Microsoft.
Wireshark: My machine is initiating a TCP 3-way handshake to the above mentioned IP address, originating from random port 50379 and destined for port 443. Using TLSv1.2, I see a key and cipher change, an encrypted handshake, and then appliction data being
transferred. The conversation ends with a 3-way goodbye, BUT immediately after the fin ack, my machine sends a rst ack and the conversation begins again. Ad nauseam.
Any info or help would be greatly appreciated. I feel like my machine has the literal hiccups. I've run Avast and MalwareBytes to eliminate malicious software. Both came up clean. I have no issues detected
in Action Center. The most recent thing I've done was install HP drivers for my PhotoSmart D110a. I have uninstalled both the drivers and software from HP. To be honest, I am completely over Windows 8. I feel like I've had nothing but problems with it. Way
too much going on with it. I'd rather have few features that work, than a million that are sub par in every sense of the phrase. End rant. If you need any more data or information from my end, please let me know. Will be more than happy to help you help me.
Thanks in advance for your time.
Bryan
p.s. I had to delete the screenshots due to my account not being verified and I can't figure out how to verify being that it doesn't ask for my email. In doing so, the text has been resized. Apologies in full.

I figured it out. I didn't look in event viewer. The issue was Asus Smart Gesture was crashing and restarting and then crashing again. This caused Error reporting to constantly send the issue. I entered the asus folder, ran the uninstall.bat, and re-installed
it. Solved it immediately.

Solaris 9, V210, bge0 network performance issue

Setup: Solaris 9, V210, single network (bge0).
ndd shows: 100FD
LAN Switch set to 100FD
Network performance bad, in fact very bad. System shows upwards of 19% collisions with netstat -- odd since FD should have no collisions. Network folks have checked switch settings and they are 100FD. I have checked more than once that ndd returns 100FD.
I am not sure what to check next. Thanks for any help you can provide in what to check next or pointing me to something I have missed.
Thanks - Wes

Means your system and the switch aren't playing nicely.
Anytime a Sun internal is showing collisions (don't care what ndd says), it means the interface is probably flip flopping between FD and HD (causing your collisions). The flip flops are causing performance to be MUCH worse then just the collisions ever would.
You might try a new factory made CAT5 network cable.
Then if that doesn't work, you should try using ndd to force the bge interface to 100FD and forcing the switch to 100FD.

Regarding Coherence Network Performance test?

Hi,
We have performed the datagram tests for two servers that we have using the coherence datagram test scripts.
We have shared the results that we got after a run of 60 – 65 seconds each for the unidirectional and bidirectional tests.
Please refer to
https://docs.google.com/spreadsheet/ccc?key=0Atn1ma-myp6ndEc0THBKRTFDSnBaN0NqV1o1Ym1jRnc#gid=0
for the results.But we want to understand from these results if this performance is under the agreeable range, for which we don’t have any absolute references with us.
Can someone suggest if this network performance is good enough or if there are any problems based on these statistics?
Quick help much appreciated. Thanks in advance.
Edited by: saiyansharwan on Jan 11, 2012 5:40 AM

Appreciate your response much. For your reference I am putitng the details on the excel sheet right on the reply.
For unidirectional test
=============
Test Parameters -
1     Buffersize     89 (Changed as exception occurred due to OS buffer size limitations)
2     Packet size     1468 (default size adopted)
3     Command on Server A     sh datagram-test.sh serverb
4     Command on Server B     sh datagram-test.sh -rxBufferSize 89 ( to limit the receive buffer size assumed by coherence to match with the actual value in the OS.)
Results:
Server A as publisher and Server B as listener
Publisher Details     Byte transfer rate for Server A     111 MB/sec
     Packet transfer rate for Server A     79550 packets/sec
Listener Details
Sl.No     Parameter     Server B values
1     elapsed     61547ms
2     packet size     1468 packets
3     throughput     111 MB/sec
          79614 packets/sec
4     received     4900000 of 4902366
5     missing     2366 packets
6     success rate     0.9995174
7     out of order     0
8     avg offset     0
9     gaps     802
10     avg gap size     2
11     avg gap time     0ms
12     avg ack time     -1.0E-6ms; acks 0
For Bidirectional test
============
Test Parameters -
Sl.No     Parameters     Values     Remarks
1     Buffersize     89     Changed as exception occurred due to OS buffer size limitations
2     Packet size     1468     default size adopted
3     Command on Server A     sh datagram-test.sh -polite serverb -rxBufferSize 89     started on polite mode to wait till it receives data
4     Command on Server B     sh datagram-test.sh servera -rxBufferSize 89
Results:
Publisher Details
     Byte transfer rate for Server A     114 MB/sec
     Packet transfer rate for Server A     81367 packets/sec
     Byte transfer rate for Server B     84 MB/sec
     Packet transfer rate for Server B     59768 packets/sec
Listener Details
Sl.No     Parameter          Server A               Server B
1     elapsed          65037ms               64932ms
2     packet size          1468 packets          1468 packets
3     throughput          107 MB/sec               65 MB/sec
               76618 packets/sec          46202 packets/sec
4     received          4982987 of 5050738          3000000 of 3001389
5     missing          67751 packets          1389 packets
6     success rate          0.9865859               0.9995372
7     out of order          0               0
8     avg offset          0               0
9     gaps          20097               119
10     avg gap size          3               11
11     avg gap time     0ms               0ms
12     avg ack time          1.149157ms; acks 309602     1.169717ms; acks 1017381
As you may observe, unlike the test you performed, bidirectional tests are showing much better success rate in this case.
But what I was looking for was some standards to compare against to decide if these statistics indicate good network performance.
Any suggestions?
Best Regards.

What is Network In and Network Out Metrics on Cloud Service

Hi,
We have hosted Cloud Services on Azure through Visual Studio Online & Setup basic Performance metrics. However not sure about Network In and Network Out Metrics on Cloud Services hosted through Visual Studio Online.
Please explain.
Regards, Subhash Konduru

Hi,
I dont think it makes any difference if deployed via VSO, as far as i know the the Network In/Out metric include the
Performance Counter
"Bytes Received/Bytes Sent", You will be charged only for the Network Out (Outbound Data).
If you have more questions/doubts I would suggest you create a Free Billing/Subscription ticket from the link below.
http://azure.microsoft.com/en-in/support/options/
Regards,
Nithin Rathnakar

How to improve database and application performance

Hi,
Any body please help me out that how can we improve the database and Application performance.
Regards,
Bhatia

bhatia wrote:
Hi,
Any body please help me out that how can we improve the database and Application performance.
Regards,
Bhatiathere is no simple answer. There is no DATABASE_FAST=TRUE initialization parameter. There are a myriad of reasons why an application is performing poorly. It could be that the application (code and data relationships) is poorly designed. It could be that individual SQL statements are poorly written. It could be that you don't have enough cpu/memory/disk bandwidth/network bandwidth.
You need to determine the root cause of poor performance and address it. If you application is poorly designed, you can tune the database until the cows come home and it won't make any difference. If you are trying to run 100k updates per second against a database hosted on hardware that only meets minimal requirements to install Oracle ... well, hopefully you get the picture.
First, go to tahiti.oracle.com. Drill down to your selected Oracle product and version. There you will find the complete doc library. Find the Performance Tuning Guide
Second, go to amazon.com and browse titles by Tom Kyte and Cary Milsap. I particularly recommend "Effective Oracle by Design" and "Optimizing Oracle Performance", though I see a lot of new titles that look promising (I think I'll be doing some buying!)

Network Performance Troubleshooting?

Greetings all,
I have a new Sun X4240 server installed as an enterprise backup media server and it's suffering terrible network performance to our new Exagrid disk storage backup appliance. The shares on the Exagrid are mounted as NFS3 shares on the server. If I cable the server directly to the Exagrid appliance, I get a reasonable 450-500 Mb/s on a simple copy from local disk to the NFS share. When I connect them back into our Cisco switch, the performance on the same copy drops to well under 20 Mb/s. A Windows server on the same switch sending traffic to CIFS shares on the Exagrid is performing quite well.
Does anyone have any ideas how to start troubleshooting this problem? Any other recommendations? Anything will be very welcome!
Sun X4240, Solaris 10 05/09 X64
Cisco Catalyst 4506, Supervisor II+ version 12.2(46), (cat4500-ipbasek9-mz.122-46.SG.bin)
WS-X4548-GB-RJ45 (48 port 10/100/1000BaseT module)
Many thanks,
Tim

I tried forcing the port settings but that still didn't work. In the end it turned out to be a problem with the code on the Cisco router. We tried a different, much cheaper Cisco router and it worked great.

X6450 network performance issue

We are seeing a network performance issue using the Blade 6000 chassis with two (10x 1 Gbps Ethernet) NEM modules. The x6450 blades in the chassis have Solaris 10 u7 installed. In our tests, we used two blades in the following manner: each blade had only one network interface connected (and plumbed in the OS level) and each blade was connected to a different NEM. Both blades were connected to the same gigabit switch. There were two other test systems (x2270-s) also connected to the same switch. We ran the following tests:
both the application client and server are on the same blade (i.e. application is using the loopback network interface): n operations/second (the number here is irrelevant, only the relation to other test numbers are relevant)
application client on first blade, server on second blade: 0.77 x n operations / second (i.e. 23% degradation)
application client on blade, server on x2270: 0.77 x n operations /second (i.e. 23% degradation)
application client on x2270, server on blade: 0.75 x n operations /second (i.e. 25% degradation)
We ran similar tests with the x2270. We did not see any difference between running the test on the loopback interface vs. running the test between two x2270-s.
Is there a known issue with these network modules or their drivers?
Edited by: kbertold on Jul 14, 2009 11:54 AM

Just use a high interval and you see how much throughput you have in that time
example: dlstat vnet1 120
Best regards,
Marcel

Xserve G5 Network Performance Questions.

Hello,
I have the latest 2.3Ghz Xserve G5 and was wondering what the optimal configuration would be for the best network performance. The unit seems to come with a couple of GB Ethernet interfaces but would a Fibre connection improve bandwidth at all? Currently this unit has direct access to a layer3 managed switch but is GB Ethernet more limiting than a fibre connection into the same switch and is a Fibre network connection possible on this unit?

Are you talking gigabit ethernet over fiber vs. gigabit ethernet over copper? Or Fiber Channel?
There's no significant difference between gigabit ethernet over fiber vs. over copper. There are some minor issues (such a a lower propagation delay in fiber vs. copper) but over short distances it's not relevant.
There are Fiber Channel cards available, but they're usually used for connectivity to storage systems (arrays, backup devices, etc.), not host-to-host connectivity.
Attaching a fiber channel storage array (such as the XServe RAID woul dhave a trickle-down effect on your network (there would be less overhead reading and writing data to disk therefore data can be pushed or pulled from the network more quickly), but it's not going to be a huge difference.
For maximum impact you could consider either trunking (combining multiple ethernet ports into a larger, virtual port) or moving to 10GbE (10 gigabit ethernet), although that will require new switches as well.
You might want to check out Small Tree, they're well versed in high performance networking and sell a range of multi-port gigabit ethernet cards as well as 10GbE solutions.

PC and Network Performance

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