RE: [Xen-devel] clock drift in Xen 4.0.0

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> >> What domU and dom0 kernel are you running?  pvops always has
> > independent
> >> wallclock.
> >
> > Dom0 is 2.6.31.12 (pvops), domU is 2.6.18.8 (not pvops). Which one
> > matters here?
> 
> I think pv_ops doesn't play with dependent-wallclock either way round:
It
> won't resync its wallclock with Xen when running as domU; nor will it
> periodically push its wallclock down to Xen when running as dom0. So
if you
> have pv_ops as the dom0 or the domU, you'd better run NTP in the domU.
> 

Just for the record, with a pvops dom0 and a non-pvops domu, you still
need to set independent_wallclock=1 for ntp to be able to modify the
clock. Without that change, ntp tells me:

time reset -409.699016 s
...
time reset -409.776693 s
...
time reset -409.854404 s
...
time reset -409.930385 s
...
time reset -410.009187 s

but never actually adjusts the time!

James


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