Re: [Xen-devel] clock source in PV Linux

[Roman Shaposhnik <roman@xxxxxxxxxx>]

On Wed, Dec 11, 2019 at 12:41 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> On 11.12.2019 09:16, Jürgen Groß wrote:
> > On 11.12.19 08:28, Jan Beulich wrote:
> >> Jürgen, Boris,
> >>
> >> I've noticed
> >>
> >> <6>clocksource: Switched to clocksource tsc
> >>
> >> as the final clocksource related boot message in a PV Dom0's
> >> log with 5.4.2. Is it intentional that it's not the "xen" one
> >> that gets used by default?
> >
> > I think this is fine. I just tested it and I'm seeing the same in dom0,
> > while in a PV domU "xen" is used per default.
> >
> > In dom0 "tsc" should be okay in case it is stable. Or are you expecting
> > problems with that setting?
>
> Well, first of all I found this surprising. Whether there are problems to
> be expected largely depends on the reliability of the "stable" detection
> in PV Dom0.

Related question: does this mean that tsc is now default for PVH as well?

The reason I'm asking is because I'm still a bit worried about the
clock drift with tsc.

Thanks,
Roman.

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