[fedora-virt] Windows clock synchronization

[Jamie Fargen]

On Tue, Jun 25, 2013 at 3:01 PM, Cole Robinson <crobinso at redhat.com> wrote:

> On 06/24/2013 02:18 PM, Ján ONDREJ (SAL) wrote:
> > Hello,
> >
> >   I have clock synchronization problems with Fedora 18/KVM host and
> windows
> > server guests.  Different 64bit windows servers, all has some time
> > synchronization problems.
> >
> >   Some of them will slow down time until time difference is 60 seconds
> and
> > then clock is synchronizes from internet. But 60 seconds is a long time.
> > Kerberos authentication sometimes files due to time skew.
> >
> >   Some machines will run OK day or two, but then clock stops. After some
> > hours clock is synchronized again and continues to work properly.
> > Curious, that during time is stopped, server works properly (except
> kerberos
> > authentications, which is very time sensitive.
> >
> >   For example, attaching 2 graphs from 2 windows servers. They show time
> > difference measured by check_mk nagios plugin. 10k means 10000 seconds.
> >
> >   How I should set clock/time/NTP on these guests?
> >
> >   I have absolutelly no problems with Linux guests, they work perfectly.
> >
>
> Maybe try altering the guest config with:
>
>       <clock offset='utc'>
>         <timer name='pit' tickpolicy='delay'/>
>         <timer name='rtc' tickpolicy='catchup'/>
>       </clock>
>
> https://bugs.launchpad.net/nova/+bug/1011848
> https://bugzilla.redhat.com/show_bug.cgi?id=828332
>
> virt-manager/virt-install should be doing this by default.
>
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>

Have you checked the clock of the hypervisor the guest is running on?
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