From owner-freebsd-hackers  Wed Apr 25  9:14:37 2001
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From: "Guy Helmer" <ghelmer@palisadesys.com>
To: <jf@trispen.com>, <freebsd-hackers@freebsd.org>
Subject: RE: if_dc and bridging
Date: Wed, 25 Apr 2001 11:14:53 -0500
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FWIW, we have seen similar problems (poor throughput, TX underrun, and
watchdog timeouts) with plain TCP (not bridging) on systems with built-in
Davicom DM9102 devices running FreeBSD 4.0 and 4.2.  Reboot improves the
performance for a while.  There seems to be a few problems with the Davicom
chip...

Guy Helmer, Ph.D.
http://www.palisadesys.com/~ghelmer/
Sr. Software Engineer, Palisade Systems
ghelmer@palisadesys.com

> -----Original Message-----
> From: owner-freebsd-hackers@FreeBSD.ORG
> [mailto:owner-freebsd-hackers@FreeBSD.ORG]On Behalf Of Jacques Fourie
> Sent: Wednesday, April 25, 2001 10:53 AM
> To: freebsd-hackers@FreeBSD.ORG
> Subject: if_dc and bridging
>
>
> When doing bridging (Luigi's standard bridging code) using two Davicom
> DM9102A NIC's, I am seeing some strange results.
>
> If I do a 'ping -s 8000' between two PC's sitting on either side
> of the bridge,
> I see a whole bunch of TX underrun errors on both NIC's of the bridge.
> Eventually both are put into store and forward mode.
> After this, I can hardly get any traffic through the bridge at all
> (maximum throughput I have seen is around 1kB/s). After a reboot,
> everything
> is OK again.
>
> Does anyone have any idea what is going on? (The bridge is running
> 4.2-RELEASE)


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