From owner-freebsd-hardware  Fri Feb 16  7:52:58 2001
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Date: Fri, 16 Feb 2001 07:52:54 -0800
From: Darren Shepard <shepard@engr.orst.edu>
To: "Eric A. Sproul" <eric@ericsproul.to>
Cc: freebsd-hardware@FreeBSD.ORG
Subject: Re: mysterious lock-ups
Message-ID: <20010216075254.A17121@eel.ENGR.ORST.EDU>
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> Hi,
> I am experiencing mysterious lock-ups on a brand new 4.2 box that I
> recently built.  I have very little evidence to go on since *nothing* is
> logged-- making me think it's hardware-related.  The system becomes
> completely unresponsive from the network as well as the serial
> console.  All I have that is somewhat unusual are some console messages
> related to the net card.
> 
> This system has an FIC AZ-11 board with an AMD Duron 700 and 128 MB of
> Kingmax "TinyBGA" SDRAM.  I am not overclocking the chip.  The hard
> drive is a Western Digital WD205BA (20.5 GB 7200 RPM ATA-66).  The
> network card is a Linksys LNE100TX 10/100 PCI.  I have built a custom
> kernel with the following netcard support:
> 
> device          miibus          # MII bus support
> device          dc              # DEC/Intel 21143 and various workalikes
> 
> It shows up in dmesg as:
> <ADMtek AN985 10/100BaseTX>
> 
> The console messages that I saw were:
> 
> Feb 16 09:13:59 gryphon /kernel: dc0: TX underrun -- increasing TX
> threshold
> Feb 16 09:14:11 gryphon /kernel: dc0: watchdog timeout
> Feb 16 09:56:20 gryphon /kernel: dc0: TX underrun -- increasing TX
> threshold
> 
> I have never seen these before so I don't know if they are unusual or
> just normal.  Could this be related to a lock-up or do I need to check
> elsewhere?
> 
> Thanks in advance,
> Eric


On my 4.2 system with two Linksys LNE100TX cards I frequently recieve
similar messages (no 'watchdog timeout', but the 'TX underrun'), 
usually during times of high network activity.  I've been getting 
these messages for quite some time (IIRC since 4.0), but everything
seems to work fine.  

I'm curious as to their origin though...

-- 
Darren Shepard | dss@orst.edu


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