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Subject: Re: kernel 2.6.37 : oops in cleanup_once
From: Eric Dumazet <eric.dumazet@gmail.com>
To: Yann Dupont <Yann.Dupont@univ-nantes.fr>
Cc: linux-kernel@vger.kernel.org, netdev <netdev@vger.kernel.org>
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Date: Mon, 14 Mar 2011 14:14:24 +0100
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Le lundi 14 mars 2011 à 11:44 +0100, Yann Dupont a écrit :
> Le 02/02/2011 16:08, Eric Dumazet a écrit :
> 
> 
> > I suspect a mem corruption from another layer (not inetpeer)
> >
> > Unfortunately many kmem caches share the "64 bytes" cache.
> >
> > Could you please add "slub_nomerge" on your boot command ?
> >
> ...
> 
> >
> >> -Is there a very severe impact on performance ?
> >>
> > not at all
> >
> Maybe there is an impact after all : since then, we don't have problems 
> anymore !
> 
> linkwood:~# uptime
>   11:42:03 up 39 days, 17:08,  3 users,  load average: 0.01, 0.03, 0.05
> 
> So... could slub_nomerge hide or simply avoid the problem ?
> Or are we just lucky this time ?
> 
> 

I would say you are lucky ;)

Not all memory corruptions are noticed. Sometimes it touch unused parts
of memory, or some parts with no critical content.


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