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SubjectRe: [PATCH] raise tsc clocksource rating

* Zachary Amsden <> wrote:

> On Mon, 2007-10-29 at 20:10 -0300, Glauber de Oliveira Costa wrote:
> > From: Glauber de Oliveira Costa <glauber@t60.localdomain>
> >
> > tsc is very good time source (when it does not have drifts, does not
> > change it's frequency, i.e. when it works), so it should have its rating
> > raised to a value greater than, or equal 400.
> >
> > Since it's being a tendency among paravirt clocksources to use values
> > around 400, we should declare tsc as even better: So we use 500.
> Why is the TSC better than a paravirt clocksource? In our case this
> is definitely inaccurate. Paravirt clocksources should be preferred
> to TSC, and both must be made available in hardware for platforms
> which do not support paravirt.

if it's inaccurate why are you exposing it to the guest then? Native
only uses the TSC if it's safe and accurate to do so.

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