linux-kernel - Re: AVX "Sandy Bridge" hardware issue?

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Message-Id: <20110715091234.087d94a2.mk@cognitivedissonance.ca>
Date:	Fri, 15 Jul 2011 09:12:34 -0400
From:	MK <mk@...nitivedissonance.ca>
To:	linux-kernel@...r.kernel.org
Subject: Re: AVX "Sandy Bridge" hardware issue?

On Tue, 12 Jul 2011 17:49:35 -0700
Andi Kleen <andi@...stfloor.org> wrote:
> If there's a problem then it's likely in the VM. Maybe it leaks
> AVX partially through only.
> 
> For example I had a similar problem a long time ago on a system
> which had inconsistent CPU features for different CPUs. The kernel
> will chose the least common denominator, but an application
> directly calling CPUID can sometimes see different flags and then
> crash when it switches CPUs.
> 
> The symptoms would be consistent with that.
> 
> I would contact the VM vendor.

I think I will go the developer list for openVZ first and get some more
info.  The vendor is trepidatious as no one else has had a problem (I
dunno how many, if any, of the other clients use mod_perl) and this
could be an unsolvable headache headache for them.

Thanks all for the input!

-- 
"Enthusiasm is not the enemy of the intellect." (said of Irving Howe)
"The angel of history[...]is turned toward the past." (Walter Benjamin)

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