[fedora-virt] Windows clock synchronization

[Cole Robinson]

On 07/03/2013 01:54 AM, "Ján ONDREJ (SAL)" wrote:
> 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?
> 

Possibly, please file a Fedora qemu bug and list all the info you've given here.

Thanks,
Cole