Re: [Qemu-devel] Occasional clockjump in Win2012 after Live Migration

[Peter Lieven]

Am 13.12.2013 13:53, schrieb Vadim Rozenfeld:
> On Fri, 2013-12-13 at 12:50 +0100, Peter Lieven wrote:
>> Am 13.12.2013 11:10, schrieb Vadim Rozenfeld:
>>> On Fri, 2013-12-13 at 09:27 +0100, Peter Lieven wrote:
>>>> Am 13.12.2013 05:12, schrieb Vadim Rozenfeld:
>>>>> Does your VM belong to domain or workgroup? 
>>>> We had 2 vServers where this happened. One was a Domain Controller and the 
>>>> second was an independent Workgroup Server.
>>>>
>>>> Do you have evidence how the DateTime Clock is driven in Windows 2012?
>>> Should be CMOS periodic timer.
>> you mean the RTC?
> Right.
>> Ok, so if there is a huge clock jump this one must have got messed up?
> It might be. We have seen some similar problem during WHQL testing some
> time ago. The problem happened because time on the host was not set
> correct. So guest was taking this wrong time on boot and then it was a
> big jump after resync with domain controller.
our system forbids starting of vservers on a host where the time is not 
synched. ;-)

the big jump i see seems to be introduced by the live migration. i will 
investigate further.

Peter