Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933282Ab0FBWyw (ORCPT ); Wed, 2 Jun 2010 18:54:52 -0400 Received: from earth.cora.nwra.com ([65.44.101.180]:58552 "EHLO earth.cora.nwra.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932918Ab0FBWyv (ORCPT ); Wed, 2 Jun 2010 18:54:51 -0400 Message-ID: <4C06E125.1090201@cora.nwra.com> Date: Wed, 02 Jun 2010 16:54:29 -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: Alexander Graf CC: Gleb Natapov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: Clock jumps References: <20100525062100.GP22163@redhat.com> <4BFD5616.6070302@cora.nwra.com> <4D7E210A-4694-4B6E-B721-6024CE96ABC0@suse.de> In-Reply-To: <4D7E210A-4694-4B6E-B721-6024CE96ABC0@suse.de> 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 Content-Length: 1949 Lines: 42 On 05/26/2010 11:31 AM, Alexander Graf wrote: > > On 26.05.2010, at 19:10, Orion Poplawski wrote: > >> 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. > > Do you have ntpd running inside the guest? I have a bug report lying around about 2.6.33 with kvm-clock jumping in time when ntpd is used: https://bugzilla.novell.com/show_bug.cgi?id=582260 > > Alex > Turning off ntpd and chronyd did not help for me. -- 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 -- 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/