Re: kvm somehow exempt from frequency scaling?

Anthony Liguori
2007-04-12T03:41:09Z

Avi Kivity wrote:
> David Abrahams wrote:
>
>> on Wed Apr 11 2007, David Abrahams <dave-UB3wUj7V41K5azolltMz9laTQe2KTcn/-AT-public.gmane.org> wrote:
>>
>>
>>
>>>> Does qemu behave differently if you use -no-kvm?
>>>>
>>>>
>>> Haven't tried that one yet.
>>>
>>>
>> Newsflash: yes, it does. The VM keeps using cycles at a normal rate
>> even when not on a visible workspace. This problem appears to be
>> KVM-specific.
>>
>>
>
> Amazing.
>
> Can you strace a hung vm and post the log?
>

I've heard of this occurring without KVM (although I don't recall if
kqemu was involved). I've never been able to reproduce myself.

An strace or core dump (via kill -SEGV) would be terribly useful in
seeing what's going on.

Regards,

Anthony Liguori