Re: kvmclock doesn't work, help?

Paolo Bonzini
2015-12-15T08:42:09Z

On 14/12/2015 23:31, Andy Lutomirski wrote:
> > RAW TSC NTP corrected TSC
> > t0 10 10
> > t1 20 19.99
> > t2 30 29.98
> > t3 40 39.97
> > t4 50 49.96
> >
> > ...
> >
> > if you suddenly switch from RAW TSC to NTP corrected TSC,
> > you can see what will happen.
>
> Sure, but why would you ever switch from one to the other?

The guest uses the raw TSC and systemtime = 0 until suspend. After
resume, the TSC certainly increases at the same rate as before, but the
raw TSC restarted counting from 0 and systemtime has increased slower
than the guest kvmclock.

Paolo

> The only things that need to be monotonic are the output from
> vread_pvclock and the in-kernel equivalent, I think.