netdev - Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at skb_copy_and_csum

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Date:	Fri, 20 Aug 2010 12:19:06 +0300
From:	Plamen Petrov <pvp-lsts@...uni-ruse.bg>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org
Subject: Re: [Bugme-new] [Bug 16626] New: Machine hangs with EIP at skb_copy_and_csum_dev

На 20.8.2010 г. 11:31, Plamen Petrov написа:
...
> The next thing I will be trying is disabling
> GRO for the tg3 network card in my network
> startup scripts via my shiny new ethtool... ;)

So, for nearly half an hour now running 2.6.36-rc1-FS-00127-g763008c:

>
root@fs:~# w; uname -a
>  12:09:48 up 26 min,  1 user,  load average: 2.43, 1.93, 1.26
> USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
> root     pts/0    192.168.10.159   12:09    0.00s  0.02s  0.00s w
> Linux fs 2.6.36-rc1-FS-00127-g763008c #1 SMP Thu Aug 19 07:10:57 UTC 2010 i686 Intel(R) Pentium(R) D CPU 3.00GHz GenuineIntel GNU/Linux

And that's with the usual load, which can be found here:
http://pvp.now.im/s/drraw.cgi?Mode=view;Dashboard=1173713287.13177

The only addition I made was running
	ethtool -K ethX gro off
for each network card.

Which means that I have a Broadcom Tygon 3 (tg3) which doesn't
like "generic-receive-offload" at all!

With "generic-receive-offload" off, I will stay on
2.6.36-rc1-FS-00127-g763008c for as long as I can, just to
confirm that in fact the "default on" setting for gro in the
tg3 driver is the culprit for my troubles...

Where to next?
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