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Message-ID: <4BC48460.4040001@gmail.com>
Date:	Tue, 13 Apr 2010 15:49:04 +0100
From:	stephen mulcahy <smulcahy@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Ben Hutchings <bhutchings@...arflare.com>,
	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 mardi 13 avril 2010 à 15:27 +0100, stephen mulcahy a écrit :
>> Ok, I've tried both of the following with my reproducer
>>
>> 1. ethtool -K eth0 tso off
>>
>> RESULT: reproducer causes multiple hosts to be come unresponsive on 
>> first run.
>>
>> 2. ethtool -K eth0 tx off
>>
>> RESULT: reproducer runs three times without any hosts becoming unresponsive.
>>
>> -stephen
> 
> Thanks Stephen !
> 
> Now some brave fouls to check the 6410 lines of this driver ? ;)
> 
> Question of the day : Why TSO is broken in forcedeth ?
> Is it generically broken or is it broken for specific NICS ?
> 

Actually, it is only when tx-checksumming is turned off that the problem 
  doesn't occur (so I'm not sure TSO is the problem).

Additionally, a google also turns up this existing Debian bug 
http://bugs.debian.org/506419 which seems to be related.

-stephen

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