Re: Clock jumps

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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@xxxxxxxxxxxxx
Boulder, CO 80301              http://www.cora.nwra.com
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