linux-kernel - Re: Clock jumps

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Date:	Wed, 26 May 2010 11:10:46 -0600
From:	Orion Poplawski <orion@...a.nwra.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: Clock jumps

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