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Super Slow Gigabit (1MB/s)

post #1 of 17
Thread Starter 
I have a Realtek 8111C connected to a NVIDIA nForce 520 over Gigabit with a Cat6 550MHz cable.

From cold boot the speed is good, 125MB/s r/w as usual. But then if I resume either computer from sleep the network is crawling at 1MB/s to 6MB/s. Sometimes it does this randomly. Not during a file transfer, but I'll go to copy a file or open an outlook profile from the other computer and it will be back to 1MB/s or 6MB/s.

To fix this, I can usually change Interrupt Moderation and Flow control from On to Off, and then back on again on both computers, and magically the speed is back up again.

Is there a fix to this? All my drivers are latest(2008 for the nForce, Jan 2011 for Realtek). The Cat6 cable is brand new.

Switching the NIC settings back and forth is a real hassle. I just want my dang Gigabit to work properly all the time!
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post #2 of 17
Have you set the link speed on the NICs manually?

Sometimes NICs get confused as to what speed they should be transmitting at so they alternate from one to another. This 'flapping' won't always be noticeable for basic networking tasks but I can kill data transfer speeds.
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post #3 of 17
Thread Starter 
That option is not available in the nForce drivers, but I have 1Gbps set in the Realtek options.

hS4ht.png
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post #4 of 17
If both of the drivers are up to date on each nic, and theres no issue with the wire between them, start checking network activity via taskmanager. You may have malware OR another program hogging up bandwidth, without you knowing...
    
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post #5 of 17
Thread Starter 
Quote:
Originally Posted by Rayzer76;12486011 
If both of the drivers are up to date on each nic, and theres no issue with the wire between them, start checking network activity via taskmanager. You may have malware OR another program hogging up bandwidth, without you knowing...

These are both fresh Windows 7 installs. One is 32 bit, one is 64 bit. No malware, no unwanted programs. I would obviously see the network activity in task manager.

The link speeds show the same, 1Gbps on both computers. But sometimes it shows up to 1% network usage(when it is slow), and 90-100% when it is working properly.
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post #6 of 17
Quote:
Originally Posted by Dink;12486209 
These are both fresh Windows 7 installs. One is 32 bit, one is 64 bit. No malware, no unwanted programs.

Hmmm. No router in between them? Time to try a crossover cable i would assume.

Edit: http://www.winnpsb.org/tutorials/rj45/default.htm this is for making rj45 with crossover

When you right click on the nic adapter, hit status, do they both say 1gbps?

EDIT2: Control panel/ programs and features/ turn windows features on and off/ disable "Remote differential compression"
Edited by Rayzer76 - 2/22/11 at 3:00pm
    
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post #7 of 17
I'd +1 for an autonegotiation issue.
~1 MB/sec would be indicative of syncing at 10 Mbps.

If you force the Realtek to 1 Gbps, the other card should only be allowed to sync at that speed, or the entire link should fail, assuming you are just using a crossover between machines.

There is a flag in the options (or should be) titled "Auto Disable Gigabit" which is noted as a power saving issue, that I would make sure is disabled.

You could always try another cable as well, might possibly be encountering interface errors at gigabit and drops down to a lesser speed occasionally. Did you terminate the ends yourself?
Edited by beers - 2/22/11 at 3:09pm
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post #8 of 17
Thread Starter 
I tried the remote differential trick on both, but no luck. The status always says 1.0Gbps. I tried with a Cat5e crossover cable and the same thing happens. It works for a while and then the network crawls until I switch the interrupt moderation and flow control options.

Auto disable gigabit is off. Kind of stupid the nForce options don't have one for gigabit, but the adapter says it is Gigabit!!! I have to set the nForce one to auto so it will grab the 1Gbps link from the Realtek NIC.
Edited by Dink - 2/22/11 at 3:15pm
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post #9 of 17
It can also be the fault of your hard-drives. If you dont have SSDs, accessing more than 1 file at a time will massively cut throughput.
post #10 of 17
Thread Starter 
Quote:
Originally Posted by ShamrockMan;12486819 
It can also be the fault of your hard-drives. If you dont have SSDs, accessing more than 1 file at a time will massively cut throughput.

Hard drive activity is 0. 125MB/s is nothing for these computers.

Ok I got it working, large files copy fast. But if I try to copy 12,000 tiny files it slows.

MNfjd.png

Again this is not hard drive or CPU related. I'm not stupid. I would notice 100% usage on a core or 100% hard drive activity. Both are under 10%.
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