100mbps switched network, slow transfer rates.

From: Alastair Grant (ask_at_for.it)
Date: 12/13/03 

Date: Sat, 13 Dec 2003 20:38:29 +0000

Hi,

I am about to cry, I cannot seem to figure this one out. I have several
boxes running various different builds of Linux. All connected with
some random Cisco (not at farm, not entirely sure what model) 100Mbps
switches.

On an idle network one would expect a nice 10MB/Sec transfer rate
between machines, alas this is not the case. Some boxes can do this,
some can only download at this, and others just give up the ghost.
There is no difference between the boxes, they are all running the same
hardware.

Now I have tried different network cards etc, but the results are the
same. I have two boxes which are both running SuSE 9 (one with
2.6.0-test5-10-smp and the other with 2.4.21-144-smp4G). Plus other
boxes running fun things like RedHat - and same results.

All boxes have 100Mbps Full-Duplex forced, and the switch seems to
confirm this. Although the through-put is indicating 10Mbps Half-Duplex
at the best. I cannot for the life of me figure out why this is. I've
checked hard drive I/O, which is all normal, the systems are all idling.

Is there anybody who can help, hint, or suggest anything that might be
able to help me?

I am using these nics:
3Com 3C905C-TX Fast Etherlink
Intel EtherExpress PRO/100+

Cheers,

Alastair. 

-- 
http://www.wireplay.co.uk/
http://www.aligrant.com/
"Never be ashamed of not knowing a
thing, but always be ashamed of not
wanting to know."

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