Re: Make QEmu HPET disabled by default for KVM?

Avi Kivity
2010-03-11T08:28:14Z

On 03/11/2010 10:23 AM, Sheng Yang wrote:
>>> I have kept --no-hpet in my setup for
>>> months...
>>>
>> Any details about the problems? HPET is important to some guests.
>>
>>
> Seems like HPET reaction is too slow to satisfy some guests(for it would
> replace PIT).
>
> Here is the thread last time.
>
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/44899
>
>

Thanks. We can address this in three ways: first, adjust the guest not
to do timing related tests when virtualized (since no matter what we do,
the tests may fail). Second, I think we should implement userspace ack
notifiers (similar to tpr access notifiers already present). Third, we
can implement a kernel hpet, which, after we solve the zillion bug it
introduces, will also give a nice performance improvement for hpet
intensive workloads.

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