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Date: Mon, 07 Feb 2011 13:14:22 +0600
From: Eugene Grosbein <egrosbein@rdtc.ru>
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Cc: freebsd-net@freebsd.org
Subject: Re: em0 hangs without any messages like "Watchdog timeout",	only
 down/up reset it.
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On 07.02.2011 03:40, Lev Serebryakov wrote:
> Hello, Freebsd-stable.
> 
> 
>   My em0 (the same, copy'n'paste hardware info from previous
>   mnessage):
> 
> em0@pci0:0:25:0:        class=0x020000 card=0x82681043 chip=0x10bd8086 rev=0x02 hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = 'Intel 82566DM Gigabit Ethernet Adapter (82566DM)'
>     class      = network
>     subclass   = ethernet
>     bar   [10] = type Memory, range 32, base 0xfea40000, size 131072, enabled
>     bar   [14] = type Memory, range 32, base 0xfea79000, size 4096, enabled
>     bar   [18] = type I/O Port, range 32, base 0xdc00, size 32, enabled
>     cap 01[c8] = powerspec 2  supports D0 D3  current D0
>     cap 05[d0] = MSI supports 1 message, 64 bit
>     cap 09[e0] = vendor (length 6) Intel cap 2 version 0
> 
> It is on-board LAN on Q35-based MoBo (ASUS P5E-VM DO)
> 
>   It hangs under load without any output. When it works with POLLING, it
> prints "Watchdog timeout" and reset automatically several times a day,
> but without POLLING it simply hangs with same frequency. It is
> 8.2-PRERELEASE (from RELENG_8), cvsupped AFTER 22 Jan (last commit to
> e1000 drivers family).
> 
>   Locally system works, but mbufs are overfilled. "ifconfig em0 down
> && ifconfig em0 up" solves problem.
> 
>  Output of different diagnostic tools (vmstat, netstat, ifconfig,
> sysctl of dev.em.0 tree, top -S) are attached in one file.
> 
>   Early (about half year ago) this sytem works without any problems
>  with net.

Have you read thread "em driver, 82574L chip, and possibly ASPM" in net@ ?