Hi Pasi,

I gave up on the idea of using jiffies as the clocksource.

I was unable to get ntpd to lock onto any time sources with clocksource set to 
jiffies. The jitter and offsets just went crazy.

I'm now turning off all power saving in the bios and reverting to the default 
clocksource. I read that the xen time source attempts to do "stuff" if it 
reckons some ticks went missing. Apparently a cause of missing TSC ticks can 
be going to sleep on some CPUs.... who knows. Something to do with the 
max_cstate.

Cheers
V

On Tue, 14 Dec 2010 06:07:57 am Pasi Kärkkäinen wrote:
> On Mon, Dec 13, 2010 at 11:30:35AM +1100, Virgil wrote:
> > Found this in /var/log/messages as the last thing prior to death.
> > 
> > Clocksource tsc unstable
> > 
> > Did some Googling and found some people changed the dom0 clocksource.
> > 
> > Added clocksource=jiffies to the kernel commandline.
> 
> I believe jiffies is not a very good clocksource..
> 
> -- Pasi
> 
> > Will see if it does anything.....
> > 
> > V
> > 
> > On Wed, 17 Nov 2010 12:00:01 pm Virgil wrote:
> > > Host crashed. Running HVM fc14-32.
> > > 
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > Skipping 86000 seconds.
> > > ...
> > > ...
> > > ...
> > > ...
> > > Kaboom
> > > 
> > > Cheers
> > > V
> > > 
> > > On Mon, 8 Nov 2010 07:43:36 am M A Young wrote:
> > > > I have built another 2.6.32.x based kernel
> > > > (2.6.32.25-172.xendom0.fc12) at
> > > > http://koji.fedoraproject.org/koji/taskinfo?taskID=2583536 and the
> > > > repository http://repos.fedorapeople.org/repos/myoung/dom0-kernel/ .
> > > > This updates the kernel from 2.6.32.25-rc1 to 2.6.32.25 (which may
> > > > not actually change anything), and uses a later version of
> > > > xen/stable-2.6.3.32.x which adds a couple of xen fixes.
> > > > 
> > > >         Michael Young
> > > > 
> > > > --
> > > > xen mailing list
> > > > xen@lists.fedoraproject.org
> > > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > > 
> > > --
> > > xen mailing list
> > > xen@lists.fedoraproject.org
> > > https://admin.fedoraproject.org/mailman/listinfo/xen
> > 
> > --
> > xen mailing list
> > xen@lists.fedoraproject.org
> > https://admin.fedoraproject.org/mailman/listinfo/xen
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