From mboxrd@z Thu Jan 1 00:00:00 1970 From: Orion Poplawski Subject: Re: Clock jumps Date: Wed, 26 May 2010 11:10:46 -0600 Message-ID: <4BFD5616.6070302@cora.nwra.com> References: <20100525062100.GP22163@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org To: Gleb Natapov Return-path: In-Reply-To: <20100525062100.GP22163@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.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