Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756498AbZATMnT (ORCPT ); Tue, 20 Jan 2009 07:43:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756061AbZATMmp (ORCPT ); Tue, 20 Jan 2009 07:42:45 -0500 Received: from bowden.ucwb.org.au ([203.122.237.119]:59524 "EHLO mail.ucwb.org.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755199AbZATMmn (ORCPT ); Tue, 20 Jan 2009 07:42:43 -0500 Subject: Re: [Bug #12465] KVM guests stalling on 2.6.28 (bisected) From: Kevin Shanahan To: Ingo Molnar Cc: Avi Kivity , "Rafael J. Wysocki" , Linux Kernel Mailing List , Kernel Testers List , Kevin Shanahan , Mike Galbraith , Peter Zijlstra In-Reply-To: <20090120113546.GA26571@elte.hu> References: <1232410363.4768.21.camel@kulgan.wumi.org.au> <20090120113546.GA26571@elte.hu> Organization: UnitingCare Wesley Bowden Date: Tue, 20 Jan 2009 23:12:23 +1030 Message-Id: <1232455343.4895.4.camel@kulgan.wumi.org.au> X-Mailer: Evolution 2.22.3.1 X-Sanitizer: Anomy Sanitizer on mail.ucwb.org.au MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1736 Lines: 44 On Tue, 2009-01-20 at 12:35 +0100, Ingo Molnar wrote: > * Kevin Shanahan wrote: > > > On Mon, 2009-01-19 at 22:45 +0100, Rafael J. Wysocki wrote: > > > This message has been generated automatically as a part of a report > > > of regressions introduced between 2.6.27 and 2.6.28. > > > > > > The following bug entry is on the current list of known regressions > > > introduced between 2.6.27 and 2.6.28. Please verify if it still should > > > be listed and let me know (either way). > > > > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=12465 > > > Subject : KVM guests stalling on 2.6.28 (bisected) > > > Submitter : Kevin Shanahan > > > Date : 2009-01-17 03:37 (3 days old) > > > > Yes, please keep this on the list. > > This only seems to occur under KVM, right? I.e. you tested it with -no-kvm > and the problem went away, correct? Well, the I couldn't make the test conditions identical, but it the problem didn't occur with the test I was able to do: http://marc.info/?l=linux-kernel&m=123228728416498&w=2 > This suggests some sort of KVM-specific problem. Scheduler latencies in > the seconds that occur under normal load situations are noticed and > reported quickly - and there are no such open regressions currently. It at least suggests a problem with interaction between the scheduler and kvm, otherwise reverting that scheduler patch wouldn't have made the regression go away. Regards, Kevin. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/