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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
