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Re: [Xen-devel] Clock jumped 50 minutes in dom0 caused incorrect 2008 R2

To: Mark Adams <mark@xxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Clock jumped 50 minutes in dom0 caused incorrect 2008 R2 domU time
From: wei song <james.songwei@xxxxxxxxx>
Date: Sat, 9 Oct 2010 10:15:20 +0800
Cc: xen devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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added timer_mode =2  and tsc_mode = 1 and viridian=1 into your configure file.

James Song
2010/10/8 Mark Adams <mark@xxxxxxxxxxxxxxxxxx>

My hardware is stable otherwise. I haven't had any issues for months
before, and ever since, and another server with IDENTICAL setup and
hardware did not have the issue at the same time.

Where should those settings be added?


On Fri, Oct 08, 2010 at 10:15:59AM +0800, wei song wrote:
> What's your setting of timer_mode and tsc_mode? If your hardware is not
> stable, pls try timer_mode =2  and tsc_mode = 1 and viridian=1.
> -James Song
> 2010/10/6 Mark Adams <mark@xxxxxxxxxxxxxxxxxx>
> > Hi Xen-Devel's
> >
> > Please see my note below regarding a serious issue where my clock jumped
> > in dom0. I'm sending this through to the devel list as I haven't managed
> > to glean any clear help from xen-users and the debian bug team are
> > unsure what could have caused this.
> >
> > Can you confirm if the kernel or xen controls the clock in dom0? I also
> > understand that this could be an underlying hardware issue but I have
> > another system on exactly the same hardware which hasn't had this occur.
> >
> > Any advice on how to investigate further or ensure better clock
> > stability across dom0 and domU would be appreciated.
> >
> > Also is it correct behaviour for Xen to reboot an 2008 R2 HVM domU if
> > the time moves this much? My guess is that the domU crashed when the
> > time changed, and was thus rebooted automatically. Strangely the Windows
> > 2003 server didn't get rebooted.
> >
> > If you need any more info to help please let me know.
> >
> > Thanks,
> > Mark
> >
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >

Mark Adams
Technical Manager
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