From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933970Ab0EZRV0 (ORCPT ); Wed, 26 May 2010 13:21:26 -0400 Received: from earth.cora.nwra.com ([65.44.101.180]:43622 "EHLO earth.cora.nwra.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751428Ab0EZRVY (ORCPT ); Wed, 26 May 2010 13:21:24 -0400 X-Greylist: delayed 620 seconds by postgrey-1.27 at vger.kernel.org; Wed, 26 May 2010 13:21:24 EDT Message-ID: <4BFD5616.6070302@cora.nwra.com> Date: Wed, 26 May 2010 11:10:46 -0600 From: Orion Poplawski User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9) Gecko/20100430 Fedora/3.0.4-3.fc13 Lightning/1.0b2pre Thunderbird/3.0.4 MIME-Version: 1.0 To: Gleb Natapov CC: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: Clock jumps References: <20100525062100.GP22163@redhat.com> In-Reply-To: <20100525062100.GP22163@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/25/2010 12:21 AM, Gleb Natapov wrote: > Adding kvm to CC. > > On Mon, May 24, 2010 at 04:06:32PM +0000, Orion Poplawski wrote: >> I have a KVM virtual machine running 2.6.33.4-95.fc13.x86_64 on a CentOS 5.5 >> host whose clock jumps about 8-12 hours a couple times a day. I have no idea >> what is causing it. Fedora 12 and Centos 5.5 KVM machines run fine on the same >> host. Is there any debugging I can enable to see what is jumping the clock? >> >> kvm-clock: cpu 0, msr 0:1ba4741, boot clock >> kvm-clock: cpu 0, msr 0:1e15741, primary cpu clock >> Switching to clocksource kvm-clock >> rtc_cmos 00:01: setting system clock to 2010-05-20 16:59:48 UTC (1274374788) Thanks, though I don't think it made it there. I'm also not sure it's completely limited to KVM, though that is the only running system I am currently seeing the problem on. I also see clock jumps during anaconda installs on physical hardware and apparently they have been present since at least F11. Might be unrelated though. I'm really at a loss of how to debug this though. -- Orion Poplawski Technical Manager 303-415-9701 x222 NWRA/CoRA Division FAX: 303-415-9702 3380 Mitchell Lane orion@cora.nwra.com Boulder, CO 80301 http://www.cora.nwra.com