Dropping Internet Transfer Rate

I recently upgraded to 10.5.4. Prior, I had no internet-related problems (with 10.3.9). Now, when I first connect, the connection runs normally for a few minutes (i.e. the first 3 or 4 pages load normally), but soon after the connection drops to nothing. The only way I can regain the connection is by restarting the computer, but even then, I can never load more than a dozen pages before it's done.
It is connected to a DLink DI 604 ethernet router along with a PC running Vista. The PC connects just fine, so I know it's not the connection nor the router.
I ran the Mac directly to the cable modem to see if it was a router/computer problem, but the Mac behaved the same. So (I think) I've isolated the problem to the Mac.
I went to talk to a 'Mac Genius' at a local Apple store and he told me to set up a new connection (which I did and solved nothing) and if that didn't work, to re-install Leopard (which I did and actually solved the problem of how I was to spend my afternoon).
If there is anyone that is having similar problems or knows how to fix it, PLEASE (pretty please) help. I checked this board for similar posts but I can't find any.
Thanks

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Transfer Rate To ATV Drops

When I first power up my AppleTV the wireless transfer rate shown in the Airport Utility is 270 Mbps. The rate stays at 270 for a few hours to a few days and then drops to as low as 14 Mbps. If I unplug the AppleTV and plug it back in the rate jumps back up to 270. If it were not for the fact that I observe a significant difference in HD trailer download times I might think the Airport Utility is reporting bogus transfer rates. Are the transfer rates reported by Airport Utility nonsense? Is there a problem with my AppleTV? Both? What kind of transfer rate can I really expect? Thanks.

Make sure its 2.0
USB 2.0 is about 20x faster than USB 1.1
If it is 2.0 there is no reason why it should be slow.

Hanging iMac, slow transfer rates

Hello,
I'm experiencing two problems with my iMac which I think are probably linked as they began around the same time. I've scoured these forums and several other websites for answers but I haven't found many people whose problems sound exactly like mine.
My iMac was running Tiger up until around a year and a half ago. I then upgraded to Leopard without any issues, and everything ran smoothly. About a year ago I began to experience some strange behaviour - Flash would repeatedly crash, my mouse seemed unresponsive, and the system began to hang as though it was having trouble processing things. I reinstalled Leopard and things seemed ok, though the hanging remained (at this stage it was just the umbrella spinning and things taking longer to load). I upgraded to Snow Leopard hoping this would fix the issue when it came out and things got incredibly bad. Starting up and loading to the desktop took upwards of twenty minutes!! Doing ANYTHING seemed to be a massive strain on the system. I'd literally have to spend an hour or so monitoring it just to check my email and shut down in the correct way. Additionally the USB transfer speed, and download speed, had dropped to the point where a 20mb file had an estimated time of 2 hours to or transfer from my external hard drive. Internet downloads were similar.
After as many tests as I could manage I thought it might be RAM related, and upgraded to 3gig. It had no noticeable effect. Recently, whilst trying to solve the problem, I gritted my teeth and backed everything up. I wiped the system entirely, and tried a clean install of Leopard (the last functioning OS I had). It worked, in so far as the catastrophically slow behaviour stopped, but I'm STILL left with the slow transfer speeds, and the hanging. I've since re-upgraded to Snow Leopard, and this time it functions in the exact same way as Leopard.
To describe the problem in detail: Every few seconds - the time between varies from 2s - a minute - the system stops responding for a seemingly arbitrary amount of time. Often the umbrella appears. However, when it appears frozen the dock usually responds without any issues (though is entirely impotent as I can't open anything, including Finder) and if I'm typing then when it returns to my control anything I typed will usually appear. My USB transfer rates remain, even when there's no issue, extremely low. Same with downloads. The most bizarre thing for me is that during the times the system is responding (during which is can often manage multiple tasks without any complaint) it moves and respons in an incredibly speedy, efficient way - as though the RAM upgrade has really helped.
I've tried repairing disk permissions, checking activity monitor to see what may be a strain on the system (everything looks entirely normal), I've run several diagnostics (including tests on the new RAM and the old RAM and on the external hard drives), defragged, turned out absolutely EVERYTHING unnecessary... Nothing I do seems to have any effect on this behaviour! Does anyone have ANY ideas? It's going to be a real pain to get it to an Apple store.
Edit: The reinstallation of an OS, or wiping of the hard drive took between 18 and 24 hours a time, despite it usually showing a countdown from 30 minutes the whole time.
Message was edited by: Lavantios

Hello and Welcome to Apple Discussions...
Have you tried booting from the Snow Leopard disk, running Disk Utility and checking the startup disk for errors? If not...
Insert your install disk and Restart, holding down the "C" key until grey Apple appears.
Go to Installer menu and launch Disk Utility.
Select your HDD (manufacturer ID) in the left panel.
Select First Aid in the Main panel.
*(Check S.M.A.R.T Status of HDD at the bottom of right panel. It should say: Verified)*
Click Repair Disk on the bottom right.
If DU reports disk does not need repairs quit DU and restart.
If DU reports errors Repair again and again until DU reports disk is repaired.
When you are finished with DU, from the Menu Bar, select Utilities/Startup Manager.
Select your start up disk and click Restart
While you have the Disk Utility window open, look at the bottom of the window. Where you see Capacity and Available. Make sure there is always 10% to 15% free disk space
If the startup disk appears to be ok and there's enough free disk space, try running the Apple Hardware Test
If the AHT doesn't report any problems...
experience some strange behaviour - Flash would repeatedly crash
Try uninstalling the reinstalling a new copy of flash then repair disk permissions.
Uninstall Flash
Install Flash
Carolyn

Slow transfer rate over wireless

Hi. My transfer rate (of local files) is really poor over wireless, like 500mb is taking 2 hours. Here is my setup... Powerbook to billion router (via wireless), billion to PC via ethernet cable, second ethernet card on pc to cable modem. I used to have this all hardwired (powerbook to PC by ethernet) but recently introduced the router so I can work in another room. My wireless signal is always strong and doesn't seem to be dropping. If I download a file from the internet its ok, i'm averaging 900kb/s so the data transfer doesn't seem to be dropping or lagging when routing through from the internet. The problem seems to be with local transfers to my mac from the PC drive and the external USB drive connected to the PC. Its just weird that internet throughput is ok. Does anyone have any ideas? Thanks

i've got some more info. I got a wireless card for the pc and connected via my airport card so i'm no longer using the router. I'm still getting the same thing - internet traffic ok on pc and mac via the pc, but file transfers locking between the two machines. I started thinking the disk on the pc might be damaged but the pc tansfers fine to the USB hard drive attached to it. Transfers are still locking up between usb drive and mac. its really weird. I've eliminated hardware such as the router, disks, and comms in the sense of internet throughput is ok. i've also formatted the pc and reinstalled xp so should I now be looking at config of xp or mac? thanks

Terrible Transfer Rate

Hello All:
Looking for some help. Network segmented into 1x and 2x ...with a 3620 router doing the routing in the middle. 1x and 2x both on their own switches...all is fine.
Just added a 3x segment and firewall and the transfer rate to and from this 3x from anywhere is horrific. 50 minutes for a 100mb file to or from 1x or 2x using a windows machine. Only 29 seconds for the same file using a linux machine (not great but a huge difference)
I have posted my config below but in a nutshell, I have FA0/0 on router 10.0.3.2 going into 3x switch along with the LAN port of the firewall 10.0.3.1.
Clients using 10.0.3.1 as gateway and this routes out to internet over a 3660.
No dropped packets on the router or switch....only 11 packets a sec rate on the router. No matter how I set port settings on any device...mix and match these settings, it is still the same. Can anyone tell me what the heck is going on??
Thanks
----------------------CONFIG-------------
version 12.2
service timestamps debug uptime
service timestamps log uptime
service password-encryption
hostname 3620-INTERNAL
ip subnet-zero
call rsvp-sync
interface FastEthernet0/0
description LINK TO 3X - SWITCH
ip address 10.0.3.2 255.255.255.0
duplex auto
speed auto
interface Serial0/0
no ip address
no ip mroute-cache
shutdown
clockrate 2000000
interface FastEthernet0/1
description Production link
ip address 10.0.4.2 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
interface Serial0/1
no ip address
no ip mroute-cache
shutdown
clockrate 2000000
interface FastEthernet1/0
description Corporate link
ip address 10.0.1.42 255.255.255.0
no ip mroute-cache
duplex auto
speed auto
router rip
version 2
network 10.0.0.0
ip classless
ip route 10.0.2.0 255.255.255.0 10.0.4.1
ip route 172.16.1.0 255.255.255.0 10.0.3.1
ip route 172.16.2.0 255.255.255.128 10.0.1.2
no ip http server
dial-peer cor custom
line con 0
line aux 0
line vty 0 4
login
end
3620-INTERNAL#
I just

All - Thanks to Kevin's post, I have stumbled onto something....what I don't exactly know.
In my testing, I was FTPing from my linux box on 3x to my server on 1x...transfer rate was ok, 19 seconds for 100 mb. With my windows box on 3x, I was mapping a drive and copy/paste from 1x to 3x. That was the difference.....but WHY? I need to resolve this piece of the puzzle since I need the ability naturally, to drag and drop between 3x and 1x.
Why the difference between FTP and transferring with copy paste??
Any help would be appreciated. Thanks

Gigabit ethernet + TC doesn't mean gigabit transfer rates to the TC drive..

Alright.... I've spent a ton of time trying to figure this out (probably more than I should have) and I thought I'd post my findings so that either a) I'll save someone else time out there or b) someone can tell me I'm a complete moron
So I had an airport extreme. I replaced it with a Time Capsule. I have a Windows (boooo) PC connecting directly to my TC using a gigabit ethernet card (which I bought specifically connect it to the TC) so (I thought) I could enjoy gigabit transfer speeds to the internal hard drive from the wired PC. I had some fun plans of shoving my itunes directory on the TC and letting appletv sync (yes through my pc) and keeping lots of videos there, etc. Who cares - it'd be at gigabit speeds! But, in reality, things didn't quite work that way (though my itunes directory does still live on my TC...for now).
Well, I had a semi-unique situation to do some pretty massive testing because I have 2 gigabit network cards, 1 100mb network card, and a wireless-n network card and two internal hard drives - both very fast. I also tried Cat 5, Cat 5e, and a Cat 6 cable.
And here's what I (think I) figured out:
The hard drive in TC can not achieve gigabit transfer speeds. Your transfer rates will be limited by the IO to the hard drive. In fact, it can't even come close.
Using my "fastest" setup - so Cat 6, fastest internal drive, gigabit ethernet, and transferring a file exactly 1 gig in size I was able to have a sustained transfer rate of 140 megabit per second - that's 17.4 MB/s for folks not wanting to do the math (that's reading FROM the TC. Writing TO the TC dropped the speed down to 106 megabit/second or 13.35 MB/s). Going to a 5e cable knocked that down to 130 megabit a second. Putting in a Cat 5 cable knocked me down to 110 megabit a second. Switching between my two gigabit network cards did nothing. Switching my cards between two computers did nothing.
Now, just changing the above setup to use my 100Mb network card resulted in these results: 67 megabit read (8.4MB/s) and 65 megabit write (8MB/s)...
And using wireless N, I got about 10MB/s up and down.
And just as a final test, connecting my two computers together using the 2 gigabit network cards through the TC, I was able to achieve standard gigabit speeds.
SO what does this all mean?
I think the IO to the hard drive in the TC can only read at about 140 megabit/s and write at about 110 megabit/s. I'm not sure if it's the HD itself or how it's connecting to the TC - but that's why I'm not aware of anyone getting faster transfer rates to the drive in the TC (maybe you guys are?). The gigabit ports themselves are fine - and if you're doing anything from one gigabit port to another gigabit port you'll be fine.
So stop beating yourself up trying to find some elusive XP specific issue with gigabit transfer rates (though vista had a problem - shocker), or that you must have a defective gigabit card (which is why I have two cards now instead of one :)), or that your cable must be bad ("maybe my cat 5e isn't good enough?")... it's just this drive ... or how the drive is connecting to the network - can't handle the gigabit speeds.
Unless someone else out there has another explanation? Do these speeds mesh with what you're seeing in "optimal" situations? Or maybe there's just a throttle switch for goobers like me using Windows instead of MacOS!

Hi,
the interfaces available today which connect your drives integrated electronics to your computer can handle that speeds. but the drive itself is limited by the mechanical things going on in there
You can get such transfer speeds if the data you request is in the cache of the drives internal electronics for example. Some drives have 8 MB of cache memory. So if you request to read or write less than 8 mb and (in the read case) you are lucky enough to have those few megabytes cached then you may get that performance
Regards,
somi

How to achieve the maximum file transfer rate from PXI to local host?

I will have to copy a huge amount of data (as big as 50 GB) from a PXI-8106 unit on site to a laptop. Currently it would take several hours. It is critical to max out the data transfer rate.
The standard method we've been using is just drag and drop using Windows Explorer via FTP. I tried to use FTP VIs with Filezilla Server as well but the transfer rate is only like 1.5 MB/s. Is this normal? Once I saw it was 3.0 MB/s but for some reason, that isn't happening now.
For another option, I tried to transfer data to a USB flash drive but it's even slower. As far as I know, USB 2.0 transfer rate is supposed to be around 60 MB/s but why would it be slower than 1.5 MB/s? What could be the speed limiting factor in my file transfer setup?
Any tips on improving file transfer rate would be appreciated!

Sustained 40 MB/s? That is my dream speed! The maximum speed I've ever seen here was about 25 MB/s, which is still very good, and that happened only after copying back and forth, which I explained above. Let me go through what I did with screencaps first.
These are the test tdms files to transfer in the PXI: an original file witten in the PXI and its copy file. I copied the original file from PXI to laptop and renamed it (added '_copy') and then copied it back to PXI.
FTP module is transferring the original file to the Filezilla server on laptop. Note the low speed.
FTP module is transferring the copy file to the Filezilla server on laptop. Note the higher speed.
This is the FTP sub VI I'm using. It transfers files in sub-folders (one level lower), too. The data connection is set to 'passive' on the FTP Put Multiple Files VI but it doesn't seem to make any difference. I attach the sub VI.
You tried the file transfer with a 500 MB text file. Would there be any difference if the file type was tdms? Would the RAM size matter? It is 2GB here.
And the LED is orange, which means Gigabit.
Another question: Is there any way to programmatically stop file transfer in progress? Currently, I just have to restart the PXI.
Thank you!
Attachments:
FTP.vi ‏40 KB

FTP/SFTP/FISH (etc) slow file transfer rate over LAN

Hi everyone,
I have a problem with transferring files over my home network that has been bothering me for quite some time.
I have a 802.11n router which should provide me with the transfer rate up to 150 Mbps (afaik). When I download files from the Internet, 3 MB/s data transfer rate is of no problem.
However, when receiving or sending data over LAN, the transfer rate is much slower (1.8 MB/s).
My rough guess is (after reading some papers on this topic) that TCP protocol is causing this (its flow control feature to be exact), since TCP max window size is too small on Linux by default.
So, setting TCP max window size to a greater number should solve this.
I tried putting this:
# increase TCP max buffer size setable using setsockopt()
# 16 MB with a few parallel streams is recommended for most 10G paths
# 32 MB might be needed for some very long end-to-end 10G or 40G paths
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
# increase Linux autotuning TCP buffer limits
# min, default, and max number of bytes to use
# (only change the 3rd value, and make it 16 MB or more)
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# recommended to increase this for 10G NICS
net.core.netdev_max_backlog = 30000
# these should be the default, but just to be sure
net.ipv4.tcp_timestamps = 1
net.ipv4.tcp_sack = 1
in /etc/sysctl.conf but to no avail.
So either there is no problem with the max window size setting, or the Linux kernel ignores it (maybe because /proc is no longer supported?).
Thanks for any neat ideas.
Last edited by Vena (2012-06-01 21:48:14)

Bump? No ideas whatsoever?

Wifi transfer rate issues

I've had my macbook pro for alitle while now and at one point i was transfering files to and from the internet using programs like skype with a transfer rate of upwards of 3000 kb/s. but for last few months i havn't seen numbers above 300 kb/s. What happened? is there a way to boost my speeds? ive connected to several different networks that i KNOW are MUCH faster than 300 and it still wont work right. ive looked everywhere i can think to throughout my settings and i can not find a way to improve the performance. can anyone help? get the speeds back to what i feel they should be? im very disapointed in the performance right now.

There are a lot of factors involved with WiFi speed. Noise, traffic on the WiFi network, Traffic on the internet, ISP limiting your speed, site you are uploading to and many more.
Have you thought about connecting the MBP to your router by Ethernet cable and then try these uplaods?

Multiclip Dropped Frames/Data Rates from from FW 800, 7200rpm Drive

I am using an external Lacie 7200 rpm "Little Big Disk" .. Editing DV Multiclips in Final Cut (3.6 MB/sec data rate per clip... 7 clips/streams) But it won't play back all at once, anything over 15 MB/sec data transfer rate (as I watch Activity Monitor) it starts choking and dropping frames til it just freezes. Lacie claims that this drive handles a steady 80MB/sec transfer rate... All I need to do all these streams is 26 MB/sec (That's the speed it does at work from an XSAN and no problem playing back 7 streams of DV) Is the bog down in my system the FW800, my RAM, processor, or the Cache of the drive? (16MB)

Do you have any other FireWire devices (incl. cameras) plugged into other ports on the computer or on the drive itself? There's only one FireWire bus on a G5, and it's shared between the FW800 port and the FW400 port on the back in addition to the FW400 port on the front.
If you have other devices plugged in, they can cause the entire bus to slow down to the speed of the slowest connected device.

Installed SSD but data transfer rates at 8mb/s and unresponsive

Sigh, just installed the Crucial m500 480gb SSD in my macbook pro 17" early 2011. Everything seemed well on bootup and the SSD is detected and formatted successfully. But when I run CCC, it took 2hrs to transfer 2gb.
After stopping the cloning, the SSD became unresponsive. Even disk utility crashed and cldn't start up. I had to reboot.
Then I tried manually coping a 10gb file from my existing HDD to the SSD, it started at rates of 8mb/s then dropped. It wld stop for awhile (20-30s) and continue. All the while, transfer rates keep dropping till 2-3mb/s. I stopped the transfer halfway as it was taking so long. Then the SSD became unresponsive again.
Is it safe to say that there is a problem with the SSD??
Argggg. Tks.

You might want to contact Crucial support - make sure you have the latest firmware for it too (although no available updates are listed on the Crucial site).

Super slow USB stick transfer rate. 2 Gigs in 2 hours ?

How can i speed up my USB memory stick transfer rate.
I'm using 2.4 GHz intel core i5 with 4GB 1333 MHz DDR3
Yet my 1 GHz windows laptop is much faster in copying files for the same memory stick.
How can i fix this?

You will not be able to use it on the Windows box if you change the formatting. But then you can buy another flash drive for Windows since they are cheap.
Drive Partition and Format
1. Boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
If you are preparing an external or a non-startup drive, then open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

Usb transfer rate decay drastically

hi to everybody,
i have a problem:
when i transfer to an usb, transfer rate decay drastically
tested with USB flash and microSD card with its adaptor; with Mac OS i reach the maximum, for example 10MB/s, and the transfer rate remains constant; if i use arch, it reach the maximum but after some time decay to 2 MB/s.....
is normal ??? anybody have this issue ???

Much has been posted in many distros concerning the USB flash problem.
A tutorial regarding the design of Flash devices reveals the basic problem with Flash in general.
It is designed to perform in u know what..windows. The design sets up Flash in FAT32 and lo and behold it runs best in windows!
Trying to get the industry to design specially for Linux is like trying to get a donkey to move.
There seems to be workarounds for various applied "imbedded" flash for elements of the Linux system such as usr and etc wherein reads and writes are minimal.
Cheaper Flash devices vary widely in performance due to algorithms provided or not.
Flashbench and bonnie++ are programs which provide analysis of Flash devices to determine performance of the devices under various modes. Many of the devices thusly analyzed are listed on the internet for users to examine...Linaro seems to be the main activity for such reports.
One recommend for Linux is to use ext4 and have at least 8GB of memory available..therefore 64bit. There probably are reasons for not going that route for some (including the cost).
Raid is also recommended.
The picture is indeed clouded and has been for years.
Perhaps a way to use FAT in Linux will come along but don't hold your breath!
Last edited by lilsirecho (2011-09-25 15:46:23)

ULN transfer rate (up2date) too low

Since several months ago the ULN transfer rate has been getting worse and worse on each and every one download (up2date). I'm just trying to update the OEL-5.1 with OEL-5.2, but it is impossible with the transfer rate of 39 kB/s. My average transfer rate is 1.8 MB/s.
Has anyone else experienced the same?

I've already posted my ULN data to T.R. to be further investigated. For your info
Can you provide some details about your network?No network at all, it's a development system located at my home with only one (non-shared) internet connection (ADSL-16000 kbits/sec = 1.95 MB/sec). Here are some transfer rates on another sites to compare to:
* edelivery.oracle.com/linux      1.6 - 1.7 MB/sec
* OTN (11g download)              1.7 - 1.8 MB/sec
* java.sun.com                    1.7 - 1.8 MB/sec
* many Fedora mirror sites        1.6 - 1.95 MB/sec
* etc, in average                 1.8 MB/sec
* etc, most frequently            1.7 MB/sec
Perhaps someone is downloading Indiana Jones and the kingdom of the
crystal skull, for example...Perhaps, but not using my connection. BTW, what's your transfer rate at ULN (in average, most frequently, and right now)?

Low transfer rate with NAT/Duplex/Speed settings

Hi all, I'm having this problem and I cannot find any bug or TAC case in the collection. I'm using PAT between two ethernet interfaces on a c3745 or c3845(I tried both in a lab).
If I keep the duplex and speed negociation to auto, everything works fine and it autonegotiates to full/100, but as soon as I force the duplex to full and speed to 100, the transfer rate of my FTP drops considerably. When I change the speed back to auto everything goes back to normal. I've tried the latest IOS but the problem persist.
Anyone experienced the same problem? Any ideas?
Thanks in advance,
Mariano

Fixing speed and duplex must be done on both sides. If one end remains in auto-mode the connection will default to half duplex.
This will result in a duplex mismatch between the devices.
http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm
regards,
Leo

Dropping Internet Transfer Rate

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