netdev - Re: Mass udp flow reboot linux with RealTek RTL-8169 Gigabit

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Date:	Wed, 23 Feb 2011 10:55:38 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Hans Nieser <hnsr@...all.nl>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Mass udp flow reboot linux with RealTek RTL-8169 Gigabit

Hans Nieser <hnsr@...all.nl> :
[...]
> With your patches applied to 2.6.38-rc6, I have gathered some of the
> info you requested from Seblu as well, I hope it's helpful:
> 
> 1: see attachment

Ok.

The chipset requires no trivial last minute regression fix (yet).

> 2: I'm not sure how to check the size of the packets, but I'm just
> fetching a (large) file over http/tcp, so I guess they are mostly of the
> size of my MTU which is 1500 looking at ifconfig output

Fine.

Your testcases are always based on a real download, whence including some
disk activity, as opposed to a pure network test, right ?

> For the other vmstat/ethtool/interrupts output, I started the following
> commands remotely via ssh a second or two before starting the download,
> and the machine locked up a few seconds later:

SysRq is enabled (/etc/sysctl.conf::kernel.sysrq = 1), the computer was
switched back on a no-X console before the test. Then the keyboard leds
ignore keypresses and the sysrq keys don't display anything in the
console, right ?

You may enable PCIEASPM_DEBUG, force 'pcie_aspm=off' and switch from
SLUB to SLAB but it's a bit cargo-cultish.

A bisection could help. Bisecting 2.6.35 .. 2.6.35.9 may be enough if
2.6.35.9 works well.

-- 
Ueimor
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