[fedora-virt] Windows clock synchronization

["Ján ONDREJ (SAL)"]

Hello,

On Tue, Jun 25, 2013 at 03:01:15PM -0400, Cole Robinson 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.

These didn't helped me to fix my problem. Also trying combinations
of these without success:

  <clock offset='variable' adjustment='2' basis='utc'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='yes'/>
  </clock>
  <qemu:commandline>
    <qemu:arg value='-rtc-td-hack'/>
  </qemu:commandline>

Any ideas? Is this a bug?

						SAL