netdev - Re: alignment faults in 3.6

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Message-ID: <1350053300.21172.12319.camel@edumazet-glaptop>
Date:	Fri, 12 Oct 2012 16:48:20 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Måns Rullgård <mans@...sr.com>,
	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	David Laight <David.Laight@...lab.com>, netdev@...r.kernel.org,
	Jon Masters <jonathan@...masters.org>
Subject: Re: alignment faults in 3.6

On Fri, 2012-10-12 at 10:22 -0400, Benjamin LaHaise wrote:
> On Fri, Oct 12, 2012 at 02:08:12PM +0200, Eric Dumazet wrote:
> > So yes, we built network stack with the prereq that IP headers are
> > aligned, but unfortunately many developers use x86 which doesnt care, so
> > its possible some bugs are added.
> 
> x86 does have an alignment check flag that can be set in the flags register.  
> Somehow, I doubt anyone would be willing to walk through all the noise the 
> faults would likely trigger.

If this can be mapped to an event that can be used by perf tool, that
might be useful ?




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