Slow network speed on gigabit network

Hey,
lately I tried syncing files between my desktop pc (running Arch Linux) und my laptop (running OpenSuse 12.3) connected on a gigabit network.
Rsync was incredibly slow, so I tried measuring network performance using iperf and noticed a significantly lower speed when copying from OpenSuse to Arch, rather than the other way around.
# Laptop -> Desktop (OpenSuse -> Arch)
[user@Desktop ~ ]$ iperf -s
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
[ 4] local 192.168.1.55 port 5001 connected with 192.168.1.77 port 45103
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 79.9 MBytes 66.9 Mbits/sec
user@Laptop:~$ iperf -c 192.168.1.55
Client connecting to 192.168.1.55, TCP port 5001
TCP window size: 22.9 KByte (default)
[ 3] local 192.168.1.77 port 45103 connected with 192.168.1.55 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 79.9 MBytes 67.0 Mbits/sec
# Desktop -> Laptop (Arch -> OpenSuse)
[user@Desktop ~ ]$ iperf -c 192.168.1.77
Client connecting to 192.168.1.77, TCP port 5001
TCP window size: 85.0 KByte (default)
[ 3] local 192.168.1.55 port 45037 connected with 192.168.1.77 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 1003 MBytes 841 Mbits/sec
user@Laptop:~$ iperf -s
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
[ 4] local 192.168.1.77 port 5001 connected with 192.168.1.55 port 45037
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 1003 MBytes 840 Mbits/sec
My first idea was that possibly the network switch between them may be responsible,
so I connected the two machines directly, but that doesn't change the observed behaviour.
Any ideas how that can be possible? (840 vs 67 Mbit/s) is a tremendous difference, obviously.
Althrough I'm not even sure which machine is configured incorrectly.
Last edited by TcShadowWalker (2014-05-11 16:20:19)

After fiddling around with the cabling and different configurations, I can confirm the problem actually lies with OpenSuse.
If I use iperf from a Live CD (grml) on the Laptop, both directions give full performance.
On the other hand, if I boot grml on the Desktop (replacing Arch) and the Laptop continues running OpenSuse, the problem remains.
What is even weirder is the fact that OpenSuse also manages to give full performance, if I have the cables connected before booting the system.
As soon as the system is running and I disconnect the connection for any time, the problem occurs again.
I suspect some form of duplex mismatch (http://en.wikipedia.org/wiki/Duplex_mismatch).
However, using ethtool, both systems agree that Auto-negotiation is on, the connection is full duplex and the speed should be 1000Mb/s (1000baseT/Full).
I guess I will simply ditch OpenSuse and install another Linux distribution on the Laptop.
Although I would like to understand the actual cause of the problem.

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Slow Ethernet speed on gigabit network

Hey all,
I recently dusted off my old Power Mac G4 MDD 867 to work on some old Final Cut Pro projects. I upgraded to Leopard 10.5.8 and everything has been working fine except I can't seem to achieve faster than 1 MB/s on my transfer from my Mac to my Windows7 PC of my RAID server.
I have confirmed that the Ethernet cable is working (cat5e - I even made a new one and tested it). System Preferences shows that Built-in Ethernet is has the following:
Configuration: Auto
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I transfer around large file sizes all day and this one has me stumped. I also checked the System Profiler and it shows it as gigabit. This Apple is connected directly to the Gigabit switch.
I did research and I have noticed that many people have had problems with their gigabit network speed.
FYI I tested mounting my win7 share on my mac and also mounting my Mac share on my PC - no difference in speed.
Umm - yeah it seems this ethernet card is not sensing the gigabit speed and is resorting back to 980k - 1 MB/s when it should be around 30 Mbps!!!

Possible yes, but have you tried making a new account to test in yet?
Might try Applejack before a reinstall...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
Then let it do all 5 of it's things.
At least it'll eliminate some questions if it doesn't fix it.
The 6 things it does are...
Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
First reboot will be slower, sometimes 2 or 3 restarts will be required for full benefit... my guess is files relying upon other files relying upon other files!
Disconnect the USB cable from any UPS so the system doesn't shut down in the middle of the process.
Oh, is it possible to eliminate the Switch/Router & connect directly for a test?
Message was edited by: BDAqua

Slow Ethernet speed on gigabit network - new facts

Hi,
I have the problem that I have a G4 with a built-in gigabit ethernet card that only delivers 100MBit-speed. And the switch only showed a green light (meaning 100 MBit) instead of amber light (meaning gigabit).
I found this discussion
https://discussions.apple.com/thread/2506507?start=15&tstart=0
but I cannot post my reply there as it‘s closed.
So I played a little bit around with my network settings – and to my surprise by changig my network setting for the gigabit card (on the "Ethernet" tab) manually from 1000baseT to 100baseTX I COULD MAKE THE SWITCH LIGHT CHANGE FROM GREEN TO AMBER!
Unhappily the network speed did not change (I transferred some gig files to check). But it gave me the idea that there must be a bug in some preference setting, a plist or some text file that is hidden somewhere down in system or library …
And this file seems to be hidden behind the pop-up list on the Ethernet tab of the network panel in system preferences.
Could anybody help from this point on to solve this problem?
Thanks a lot for helping
Reinhard

Hi,
thanks for your answer. I checked everything you mentioned.
Network Utility always reflects (I mean: shows the identical) speed setting in System Utilities. Having a setting there of 1000 MBit shows a speed of 1GBit in Network Utility, 100MBit here shows a 100MBit there.
But the light indicator on the switch shows differently. And the real file transfer speed always only shows 100MBit-Speed.
In the G4 there is no Airport Card built in.
The 1GBit-card is always on top of the list. This is true for the normal view in System Preferences, where it show the green indicator, too. And it‘s true when I open this additional list of Service Order after having clicked onto this gear icon.
So it‘s still the same: Green light on the switch when I set the speed manually or automatically to Gigabit. And yellow light on the switch when I set the speed to 100MBit. And always only 100MBit speed when transferring files over the network.
Thanks for helping so far. I‘d be glad if you can help further with tests and ideas.
Thanks
Reinhard

I am desperate!! slow choppy network speeds (not actual inability to cnnct)

I have a 13" macbook air that has the following problem: I can connect to wifi networks (including at home WPA and also tried WPA2 settings) but even though I may get proper speed at first, I soon lose that and it becomes much slower and choppy (if I open activity monitor I can see the speed going up and down like crazy...). My internet speed at home is 12mpbs set by my provider. When I perform speed tests (vis speedtest.net or downloading files from other speed test sites) on my windows PC that is also on this network I get the full download speed. However with this MAC while I initially did get the full speed, it is now down to an average of 3-5mbps and the activity monitor, again, shows choppy behavior so it will be at 8 then at zero almost and then up and down again but never near the full speed. I tried to connect to other networks and I have the same problem - once this happens it stays. I tried removing the airport connection in network preferences and adding it again it does not help.
I TALKED TO APPLE AND HAD MY COMPUTER TESTED BY THEM - they didn't find any hardware issues (they said it was fine - but it isn't) but they still replaced the airport hardware in the computer - both the chip and the antenna (which meant replacing the entire screen). I brought the computer home, ran a speed test and everything was fine. I thought GREAT but then something happened and the problem returned. What I did (which I think was unrelated) was connect via SMB to a PC at home and I tried to stream a movie file. I noticed it kept 'pausing' so I opened up activity monitor again and to my HORROR I saw the choppy wave with network speed very inconsistent going up and down like crazy... I tried connecting to my slingox using the sling web access after disconnecting from my home PC but got partial speed and lots of drops too. I tried the speed test again multiple times, nothing seems to work.
SO I don't know what to do at this point. I have 10.6.6 running. I heard something about a firmware update but I am new to mac so not sure how to even do that or what else I can do to solve this problem or what is causing it. BTW - logging in now from the guest account still does not fix the issues and they remain the same.
I am desperately looking for help!!
Thanks a lot!

Have you been able to reproduce your problems on other wireless networks other than at your house? It appears you are saying that this occurs on all wireless, but I'm not sure from your comment. If it's only at home, it would appear to be a compatibility issue between your wireless access point and the Macbook Air, which isn't uncommon. Sometimes a firmware upgrade to the access point can fix it, sometimes it might require switching to a different brand of access point. It would be great if you could borrow (or buy and return) a different access point/router to test. An Apple airport would be the best to use of course. Not the easiest solution, but lets you help rule out a hardware issue with your air.
My isp provides 15mbps but my wireless devices such as my iphone, ipad, laptop usually only get 6.5-8 mbps when testing speeds to the internet. I don't expect it to be as good as the wired due to interference, signal, etc. I don't get the choppy behavior however. Firware updates from Apple will appear in the same manner as standard software updates. If there is one available for your system it should appear when you check for software updates. That being said, I believe you can also manually download them from the Apple site.

[SOLVED] Network speed very slow, no apparent reason

Hello, recently I switched from Windows 7 RC1 to Arch on my home machine (I have used Gentoo, Ubuntu, and Fedora 10 on the same machine in the past), and for some reason network speed is very slow.
I have Verizon's 20mbit/5mbit package, and I have always gotten that speed.
Using speedtest.net and 100mb.test from cachefly on multiple computers I have come to the conclusion that it is infact my Arch install that is causing the problem:
- All other machines on my network are getting 20/5 (both wired and wireless)
- I ran a speedtest from 2 other machines using the ethernet cable that this PC is on. Again, full 20/5.
- scp transfer of 100mb.test from this PC -> other Arch box: ~2.8MB/s.
- scp transfer of 100mb.test from other Arch box -> this PC: ~2.8MB/s.
- scp transfer of 100mb.test from this PC -> UK VPS (100mbit line): ~539KB/s
- scp transfer of 100mb.test from UK VPS -> this PC: ~76KB/s
- scp transfer of 100mb.test from this PC -> Chicago Server (dual gbit lines): ~563KB/s
- scp transfer of 100mb.test from Chicago Server -> this PC: ~91KB/s
speedtest.net result:
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I have tried disabling TCP window scaling, and appending my hostname to /etc/hosts.
What is weird though is that the other Arch box has an identical network config, I don't see any reason why it shouldn't work.
My NIC is an integrated Realtek something, I can get the exact model if needed.
Last edited by whipsch (2009-06-05 18:29:21)

Hi, whipsch
Can you try ethtool to see if your ethernet card is actually negociating and using a 100Mb full duplex link on your LAN ? If not you can try to force the link parameter with ethtool. Also maybe the driver of your NIc has options related to link negociation.
Hope this helps,
JF

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My network has a Netgear WGT-624, that serves as DHCP server, NAT and Internet connection.
We have two mac minis (gigabit network), a G4 (standard Ethernet), some PC laptops (running 802.11b/g) and some laser printers and AIOs that runs 100 mbit Ethernet.
There's also an ancient Netgear hub, that I will replace with a D-link gigabit switch. The switch will serve the TC, a printer and the G4.
From what I understand, devices with gigabit will be able to communicate with other gigabit devices on the same network. But, will it work even if the TC is NOT used as the primary AP, but set in brigded mode? There's quite a difference in backup speed if the TC and the minis could talk to each other with gigabit.

My network has a Netgear WGT-624, that serves as DHCP server, NAT and Internet connection.
We have two mac minis (gigabit network), a G4 (standard Ethernet), some PC laptops (running 802.11b/g) and some laser printers and AIOs that runs 100 mbit Ethernet.
There's also an ancient Netgear hub, that I will replace with a D-link gigabit switch. The switch will serve the TC, a printer and the G4.
From what I understand, devices with gigabit will be able to communicate with other gigabit devices on the same network. But, will it work even if the TC is NOT used as the primary AP, but set in brigded mode? There's quite a difference in backup speed if the TC and the minis could talk to each other with gigabit.

Slow Network Speed with MacPro

I just received 4 MacPro's with the dual quad processors. I have configured 3 for our workplace and have moved them into production. We are experiencing very slow network speeds, a test file on our server of 100mb takes 2 minutes 20 seconds to copy to the desktop. I have manually set the ethernet port to 100baseT with full duplo. The old machine is running the same OS 10.4.10, and only takes 12 seconds to copy the file. I should mention that we use DAVE to connect to our servers, both machines are running the same version of DAVE, and using a third machine I connected to both drops and the file copied in 12 sec, showing that the network is physically OK. The only difference between the two machines is that one is the intel version? Can anyone offer any thing to try?
Thanks
Message was edited by: Mark Crane
Message was edited by: Mark Crane

I am 99% sure someone else had 'slow transfer' in another thread.
Sometimes a router needs firmware update to be compatible, or upgrade the cables to cat6e, or look for a new router or switch which helped my own setup. Just look for one that says that it is "Vista compatible" actually.
http://www.thursby.com/products/dave-vs-tiger.html

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Since I changed from Mac OS 9.2.2 to Mac OS X 10.3.9 on my dual 450 Power Mac i am having always the same problem. after some new starts my network speed becommes very slow. internet, printer connection and also when using personal file sharing. Folder of 22MB takes about 1 hour insted of 3 seconds to send from one mac to the other. I was trying on both HD´s and with only security update from CD before using Internet. I also have to repair volume permissions.tried reset of PRAM. tried it with both HD´s separately installed, sometimes it helped for short time. but unfortunately I always get the problem also when I am not using intenet connection after installing 10.3.9 on a completely empty HD (also tried to formate mith zeros). On my other mac´s: G3 (400MHz), G4 (500MHz) PowerBook and Power Mac G4 450(single)
the system is working without any problem. same settings! Only the Power Mac G4 dual 450 I am having this problem. Software like Photoshop, X-Press and also Maxxon 4D are running fast and without problems. Please help me!!!

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the system is working without any problem. same settings! Only the Power Mac G4 dual 450 I am having this problem. Software like Photoshop, X-Press and also Maxxon 4D are running fast and without problems. Please help me!!!

HH3 slows down network speeds

Not long ago I decided to upgrade from HH2 to HH3. I have a home network where the wired component utilises Western Digital power line devices. I have a network storage device which holds primarily music files. I regularly transfer music files around the network. Not long after installing the HH3 I noticed that file transfers were taking far longer than ever before. I used LAN Speedchecker to discover that the network speed had dropped to around 10% of previous norms. Power cycling of the HH3 solved the problem temporarily but it soon returned. Switching back to HH2 the problem disappears completely. Any suggestions as to why the HH3 may be creating the network speed issues ?

Hi Bob,
Sounds as if you might have fallen fowl of the confused hub syndrome - where the 3 x 100/10 Mb ports on what appears to be quite a few HH3A's (there is a thread not far down the speed/connection list all about it) switch between 100 and 10 Mbps..
I had a network similar to you, but all wired - my main computer connected to the gigabit hub and a 100mb port feeding a network switch that had back up hard drive - printer server and assorted others.
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Thank you for all of the detailed information. The coverage in the area looks great. All of your devices seem to drop in speeds at the same time? How is voice and text working during these times? The coverage in the area looks great, but can still be affected by congestion at peak times of usage. We may want to investigate your area further with a remedy ticket.
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Follow us on Twitter @VZWSupport

Slow network speed

I'm looking for advice on speeding up my network. I have a Time Capsule 3TB model a1409. Connected to Time Capsule are an iMac (via ethernet) and Mac Mini (via wireless). Also connected directly to the Time Capsule are two external drives: LaCie Porshe (Aperture file) and WD My Book. Streaming movies off the WD to either computer experiences delays. Additionally, Aperture navigation bogs down when pulling from the LaCie. Any recommendations to improve the streaming from these external drives.

Swap roles..
Use the 3TB internal drive for your files and use an external drive for TM backups.. the Internal drive is many times faster than the USB connected external.
USB is slow.. USB connected to the TC is half that again.. you cannot speed it up.. the very nature of the drive - usb interface is restricted.
Much better would be to use a FW800 or Thunderbolt (or USB 3 if your Macs are new type) plugged directly into the iMac / Mini. Thunderbolt is of course the fastest by long way.. same as the internal drive.. but super expensive still. USB3 is cheap and much faster than FW800.. although FW800 is reasonable. (Not the WD version of it) and USB2 is still the worst.
Share the drive with the network and that will be a great way to use files.. much better than USB on a TC.

Time-Capsule Network Speed slows down

The TC will work fine for about a week and then inexplicably begins to communicate at a very slow rate over the wireless network. If I cycle power on the TC,, it will resume normal performance for about a week, and then slow down again.
I've taken to monitoring the TC wireless speed using the airport utility. My airport devices will operate normally at about 54 Mbps and my PC clients at about 113 Mbps (I have Netgear N cards in the PCs that operate at about 108 Mbps). When the performance drops, my Mac devices will drop to around 5Mbps and the PCs will drop to 54 Mbps. Performance will continue to degrade until everything is running at 1 to 5 Mbps. I reboot the TC and everything returns to normal for another week.
Any thoughts as to what could be causing this?

Hi and welcome to the forums.
I'm not a wireless expert, but after having wireless networks at home for more than 5 years with Apple stuffI made some observations.
First, there might be issues with other networks in your neighbourhood. Many posts suggest that there should be at least 5 channels between wireless networks, e.g. 1 - 6 - 11. Set it with AirPort Utility.
Second, something called "noise" from other electronic equipment as microwave ovens and machinery.
Thirdly, having different types of equipment's and networks and speeds mixed together might not make the best network. We have the Time Machine set as working in the 5Ghz area with only the "n" protocol, while another device from the Internet Service Provider broadcasts in the slower bandwidth. In this way the slower wireless computers are running on their own net.
Fourthly, reception of the wireless network can be an issue. One older PC has been provided with an extra antenna, and that helped a lot with an nearly 100% increase in speed for that machine.

Poor network speed with 1st generation time capsule and multiple airport express 5Ghz. My network speed slows to a crawl when not close to the time capsule. I get the range that I need, but the speed is painfully slow.

Hello,
I have a first generation time capsule running 802.11n (b/g compatable) and the airport expresse's are the newer 5ghz models. I have 3 airport express's and I have the range that I need. I can run the time capsule using 802.11n 5ghz, but I loose the range and can't connect to all of the airport express's. My computers and mobile devices run 802.11n. Does anyone have any suggestions on how to increase the network speed. Would the new airport extreme fix the problem?
Thank you

Unfortunately, you are experiencing one of the downsides to 5 GHz. That's because the higher frequency 5 GHz signals are much weaker than 2.4 GHz signals.
After all, you always have to give up something to gain something else. In the case of 5 GHz, you gain potential speed but in return, you must give up penetration power and distance capability.
In order to work well, 5 GHz signals need to almost have a line-of-sight relationship between devices. Unless you can achieve this, you will do much better to leave the Time Capsule running at the 802.11n (b/g compatible) 2.4 GHz Radio Mode and allow the Express devices to "extend" that network.
As for the location of the AirPort Express devices in an exended network, that is critical for best performance. That's because the Express can only "extend" the quality and bandwidth of the signal that it receives. Post back if you need a few more tips on how to find the best location for the AirPort Express devices.
Would the new airport extreme fix the problem?
Unfortunately, no.

Slow LAN Networking Speeds after Resuming from Sleep

I use my mac mini as a HTPC running Plex. I have it connected to my Windows media server with 802.11n. Works fine but sometimes after resuming from sleep the network speed drops off to an unacceptable level (from 72 Mb/sec to 5 Mb/sec). Disconnecting and reconnecting doesn't help. Switching to G doesn't help. Only restarting the mini restores the connection to full speed.
None of my Windows clients on the same network have any troubles.
Thoughts?

Looks like Plex might be causing the problem. I always have plex running and it appears as though if Plex makes a request for a file on the share before OS X is done re-mounting it after sleep, it kills the whole process.
Shouldn't the OS be robust enough to handle a situation like this?

Slow network speed on gigabit network

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