[vortex] 3c905 Problem - Please Help

Thu Nov 22 11:31:02 2001

Hi,

I seem to have the same problem:

I have 3 pc connected through a hub, two of them can "talk" just fine to
each other, the last one however keeps giving me the same message as
mentioned below. Now I checked each and every network card (and they are
in half duplex, even forced them with the 3com dos tools). Now, since the
other two can ftp just fine at good speeds (200 KB/s) I expect no prbs
there. Now the third pc is running redhat linux 7.2, kernel 2.4.9-13, and
this one never gives good network performance, nomatter what I do...

On Thu, 22 Nov 2001, Donald Becker wrote:

> On Wed, 21 Nov 2001, Timo Boettcher wrote:
>
> >  I'm having some trouble with 3Com 3c905-Cards (namely a 3c905B-TX and
> >  a 3c905c-TX-M) in one of my Systems.
> >
> >  During times of high load on the netword-card, I get errors like:
> >
> > ======================begin paste======================
> > eth0: Transmit error, Tx status register 82.
> > Probably a duplex mismatch.  See Documentation/networking/vortex.txt
>
> Andrew (I think) added this message.  It's a very good thing.
>
> >  Depending on network-load, I get this up to two times per second,
> >  on the active console, even if I am not logged in.
> ...
> >  vortex.txt says:
> > "This is a common error which is almost always caused by another host on
> > the same network being in full-duplex mode, while this host is in
> > half-duplex mode..."
> >
> >  Since the System in question is running Half-duplex (see below),
> >  and it is connected to a Hub (Netgear DS108) which is afaik only able
> >  to do HalfDuplex anyway, this should not be the problem.
>
> Yes, it is.  Read the description.  Some other host on the network is
> incorrectly set to forced full duplex mode.  That other host is
> corrupting packets by causing out-of-window collisions.  This is a very
> bad situation that greatly increases the chance of undetected data
> corruption.
>
> > [root@server /root]# mii-tool -v
> > eth0: negotiated 100baseTx-HD, link ok
> ...
> >   link partner: 100baseTx-HD 10baseT-HD
>
> You have a bridged repeater.  The errant host is running at 100baseTx,
> since OOW collisions do not cross a bridge.
>
> > The network card *seems* to be working correctly in another machine
> > with Win2k.
>
> The network card is working correctly.  Win2k is just not reporting the
> error.
>
> Donald Becker				becker@scyld.com
> Scyld Computing Corporation		http://www.scyld.com
> 410 Severn Ave. Suite 210		Second Generation Beowulf Clusters
> Annapolis MD 21403			410-990-9993
>
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