Gigabit issues

[kzrssk]

Hey all,

I just got a D-Link gig switch and an Intel gig NIC in today. I've got the Intel NIC plugged into my server, and my server, my main box (with a Marvell gig interface), and my wireless-G router plugged into the switch, all with CAT6 and CAT5e. I tried some file copying with jumbo frames on, and I was only getting about 20 MB/sec between the server and the main box. Both CPUs weren't being maxed, and changing jumbo frames from 9k to 4k to disabled did nothing to change the transfer rates. The drive in the server is a Barracuda .9 250 GB (which puts its sustained rate at 76.6 MB/sec according to the spec sheet), and I've got some WD SATA drive in my main machine (I'm guessing it's gotta be able to do at least 50 MB/sec).

What the heck? Anyone see this sort of thing happen before? Maybe I'm just tired and completely missing something easy and mundane, but help me out, lol.

Thanks in advance, all.

 

[NickOlsen8390]

Make sure nothing else it running. Disable any firewalls. Make sure both are set to Auto Negotiate in the driver settings. The OS makes a diffrence too.
Here my setup. Vista ultimate 64-bit (2 7200.10 cuda's in raid 0) pushing to a windows 2003 box with a single 7200.7 cuda. Full Gigabit, Switch is a HP 1800-24G managed switch, jumbo frames off, Both are using onboard nic
I push about 63MB/s to it. And can pull about 58MB/s
Pushing to my main server which is xp sp3 i top out at about 48-50MB/s both ways.
Try connecting them right to each other with a cross over cable. give them both Static ip's and check speeds. If they are better send the D-link back and get something else. If there the same look into different nics to test, Or a computer issue, Try pushing to another computer.

 

[JackMDS]

Using client OS and End-User Hardware. 20MB/sec. is typical performence of Giga Home Network. (bout 3 time more then typical 100Mb/sec. LAN).

The max I ever achieved with regular hardware and none server Windows is 48MB/sec.

Make sure that your TCP/IP Stack is optimized and push the Rwin to twice the size recommeneded for your Internet "Speed".

Optimizing the TCP/IP Stack - http://www.ezlan.net/Internet_Speed.html

 

[kzrssk]

So I tried some of the suggestions and got it to go around 50 MB/sec, but another issue just popped up, which I'm thinking is driver-related, but I wanted to get a second opinion.

When I copy a file over, the server (with the Intel gig NIC) sometimes drops off the network. The only way to resolve it is to physically login to the server and disable the network card and bring it back up. Then it works until it decides to stop again. I'm using the latest drivers off Intel's site, and a quick Google search didn't seem to turn up anyone else experiencing this. I guess my next action is gonna be to try it in another computer, but it won't exactly be apples to apples, since the only other box I have is XP (uses the "same" driver, but it probably isn't exactly the same).

Can anyone think of anything?

Thanks