Guest Time Question

[Kay Hayen <kayhayen-Mmb7MZpHnFY@public.gmane.org>]

Hello,

I am currently evaluating kvm for using it for an application where correct 
time is absolutely critical. We therefore normally use NTP on these machines 
to synchronize them with GPS time. For a virtual machine in my eyes that 
means, the host should be synchronized and the guests just use that time.

My test setup is on Kubuntu 7.04 with a minimal Kubuntu 7.04 guest. I am using 
its "linux-virtual" kernel package, so I believe I should be correctly 
paravirtualized.

Now what I see with respect to system time, is that the time is lagging behind 
in the guest. Abount 1 minute after 20 minutes, and 1 second only a few 
seconds after a successful ntpdate to the hosting machine. My guess, that 
shows how little the host is used otherwise. 

So in FAQ and Wiki I didn't find how to make the guest use host time. Is that 
possible at all? For VMWare it is said that clock=pit would help, but that 
seemed to be no change.

Can you please point me to what to do? 

Best regards,
Kay Hayen

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