From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751879Ab1GONLd (ORCPT ); Fri, 15 Jul 2011 09:11:33 -0400 Received: from smtpauth21.prod.mesa1.secureserver.net ([64.202.165.38]:37844 "HELO smtpauth21.prod.mesa1.secureserver.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751139Ab1GONLb (ORCPT ); Fri, 15 Jul 2011 09:11:31 -0400 X-Greylist: delayed 354 seconds by postgrey-1.27 at vger.kernel.org; Fri, 15 Jul 2011 09:11:31 EDT Date: Fri, 15 Jul 2011 09:12:34 -0400 From: MK To: linux-kernel@vger.kernel.org Subject: Re: AVX "Sandy Bridge" hardware issue? Message-Id: <20110715091234.087d94a2.mk@cognitivedissonance.ca> In-Reply-To: References: <20110712161616.b5196a3b.mk@cognitivedissonance.ca> X-Mailer: Sylpheed 3.1.1 (GTK+ 2.22.0; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 12 Jul 2011 17:49:35 -0700 Andi Kleen 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)