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Date:      Mon, 25 Feb 2002 11:39:38 +0100
From:      Yann GROSSEL <y.grossel@hexanet.fr>
To:        freebsd-net@FreeBSD.ORG
Subject:   dc TX underrun message
Message-ID:  <20020225113938.12bf08be.y.grossel@hexanet.fr>

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Hi,

We have a new machine that is about to become a firewall.

For now this machine is running but idle, that is, it has
no services running but sshd, and no default route. The
machine has been up for about 20 days, wihtout doing
anything.

However 3 messages has been logged :

Feb  5 14:30:18 blade /kernel: dc3: TX underrun -- increasing TX threshold
Feb  5 14:58:33 blade /kernel: dc3: TX underrun -- increasing TX threshold
Feb 19 09:38:39 blade /kernel: dc3: TX underrun -- increasing TX threshold

What do these message mean ? Is there a hardware problem ?

The machine has never been tested in real use (that is, with any network
traffic), so we don't know if this problem may freeze or crash the machine
with heavy real traffic, and we can't afford to test that).

Machine details :

CPU: Pentium III/Pentium III Xeon/Celeron (699.51-MHz 686-class CPU)
FreeBSD blade.hexanet.fr 4.5-PRERELEASE FreeBSD 4.5-PRERELEASE #3:
  Tue Feb  5 14:16:17 CET 2002 root@blade.hexanet.fr:/usr/obj/usr/src/sys/BLADE
  i386
src/sys/pci/if_dc.c,v 1.9.2.31 2001/12/19 18:37:34 wpaul Exp $

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