From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Tokarev Subject: Re: 2.6.35-rc1 regression with pvclock and smp guests Date: Sat, 09 Oct 2010 12:31:42 +0400 Message-ID: <4CB0286E.6010005@msgid.tls.msk.ru> References: <4CA4DBC8.6070606@xutrox.com> <20100930190507.GA1111@amt.cnet> <4CA51715.1070507@msgid.tls.msk.ru> <4CA51847.5060208@msgid.tls.msk.ru> <4CA6C4BB.5020004@redhat.com> <4CA6E0BF.90605@msgid.tls.msk.ru> <4CA75969.1080405@xutrox.com> <4CA7C34C.4040000@redhat.com> <4CAE6203.6040902@xutrox.com> <4CAE862F.10904@redhat.com> <20101008220600.GA9430@amt.cnet> <4CB020EB.1050105@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Zachary Amsden , Arjan Koers <0h61vkll2ly8@xutrox.com>, kvm@vger.kernel.org, Avi Kivity , Glauber Costa , Andre Przywara To: Marcelo Tosatti Return-path: Received: from isrv.corpit.ru ([86.62.121.231]:58802 "EHLO isrv.corpit.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753273Ab0JIIbp (ORCPT ); Sat, 9 Oct 2010 04:31:45 -0400 In-Reply-To: <4CB020EB.1050105@msgid.tls.msk.ru> Sender: kvm-owner@vger.kernel.org List-ID: 09.10.2010 11:59, Michael Tokarev wrote: [] > As far as I can see, most of these can be dealt with > by re-loading kvm modules. Let me try these and some > of the earlier patches... So the two one-line backports, while applied to the _host_ kvm modules, eliminated all the issues I had so far with unstable clock and smp guests hanging here or there. The timestamps in dmesg are not jumping into the past anymore, and all my guests, even the most problematic ones, now boots fine (I tried several times to trigger the problem, to no avail). Just to be sure and to eliminate further possible confusion: that's host kernel 2.6.35.6-amd64, with two patches (backports offered by Marcelo) applied on top and kvm{,-amd}.ko reloaded. I tried several guests, incl. 2.6.32-i686 with the earlier debugging patches applied, and 2.6.35-i686 (these two guests were showing the issue most often). Looking at the larger patchset again, -- there were quite a few other changes too, should some of these be applied as well? I mean, we eliminated the most obvious problem, but it looks like there are more problems in there.... Thank you for your work! /mjt