Re: [RFC] Paravirt timer for KVM

Avi Kivity
2007-10-16T10:27:37Z

Gerd Hoffmann wrote:
> Hollis Blanchard wrote:
>
>> That's a good point, but does PIT/HPET emulation show up as a hot spot
>> in any profiles? I think keeping the hypercall API as small as feasible
>> is a desirable design goal.
>>
>
> pit probably doesn't due to being rarely updated. For hpet I'd expect
> it showing up much more. Asking for current time is a quite frequent
> operation in the linux kernel. I've had X86_CR4_TSD set for a while and
> saw *lots* of rdtsc traps then ...
>
>

Good point.

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