netdev - Re: forcedeth driver hangs under heavy load

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Message-ID: <4BC31AA0.5070006@gmail.com>
Date:	Mon, 12 Apr 2010 14:05:36 +0100
From:	stephen mulcahy <smulcahy@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	Ben Hutchings <ben@...adent.org.uk>,
	Ayaz Abdulla <aabdulla@...dia.com>, 572201@...s.debian.org
Subject: Re: forcedeth driver hangs under heavy load

Eric Dumazet wrote:
> Le lundi 12 avril 2010 à 13:39 +0100, stephen mulcahy a écrit :
> I am not sure I understand. Are you saying that using 2.6.30-2-amd64
> kernel also makes your forcedeth adapter being not functional ?

Hi Eric,

If I run my tests with the 2.6.30-2-amd64 kernel the network doesn't 
malfunction.

If I run my tests with the 2.6.32-3-amd64 kernel the network does 
malfunction.

If I take the forcedeth.ko module from the 2.6.30-2-amd64 kernel and 
drop that into /lib/modules/2.6.32-3-amd64/kernel/drivers/net/ and then 
reboot to 2.6.32-3-amd64 and rerun my tests - the network does malfunction.

> Are both way non functional (RX and TX), or only one side ?

Whats the best way of testing this? (tcpdump listening on both hosts and 
then running pings between the systems?)

-stephen
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