Re: Make QEmu HPET disabled by default for KVM?

Gleb Natapov
2010-03-14T07:10:40Z

On Sun, Mar 14, 2010 at 09:05:50AM +0200, Avi Kivity wrote:
> On 03/11/2010 09:08 PM, Marcelo Tosatti wrote:
> >
> >>
> >>>I have kept --no-hpet in my setup for
> >>>months...
> >>Any details about the problems? HPET is important to some guests.
> >As Gleb mentioned in the other thread, reinjection will introduce
> >another set of problems.
> >
> >Ideally all this timer related problems should be fixed by correlating
> >timer interrupts and time source reads.
>
> This still needs reinjection (or slewing of the timer frequency).
> Correlation doesn't fix drift.
>
But only when all time sources are synchronised and correlated with
interrupts we can slew time frequency without guest noticing (and only
if guest disables NTP)

> >Since one already has to use special timer parameters (-rtc-td-hack,
> >-no-kvm-pit-reinjection), using -no-hpet for problematic Linux
> >guests seems fine?
>
> Depends on how common the problematic ones are. If they're common,
> better to have a generic fix.
>
> --
> error compiling committee.c: too many arguments to function

--
Gleb.