netdev - Re: forcedeth driver hangs under heavy load

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Date:	Tue, 13 Apr 2010 14:43:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	smulcahy@...il.com, bhutchings@...arflare.com,
	netdev@...r.kernel.org, ben@...adent.org.uk, aabdulla@...dia.com,
	572201@...s.debian.org
Subject: Re: forcedeth driver hangs under heavy load

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 13 Apr 2010 16:42:21 +0200

> 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 ?

Do you really come to the conclusion that TSO is broken with the above
test results?

I would conclude that there is a TX checksumming issue, since merely
turning TSO off does not fix the problem whereas turning TX
checksumming off does.
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