Re: [kvm-devel] kvm somehow exempt from frequency scaling?

David Abrahams
2008-07-06T14:06:25Z

on Sun Jul 06 2008, Avi Kivity <avi-AT-qumranet.com> wrote:

> [Resurrecting old thread]
>
> David Abrahams wrote:
>> on Tue Apr 10 2007, Michael Riepe <michael-0QoEqw4nQxo-AT-public.gmane.org> wrote:
>>
>>
>>> Hi!
>>>
>>> Avi Kivity wrote:
>>>
>>>
>>>> Sounds like ondemand is broken.
>>>>
>>> Maybe it only switches when the load rises in user space. With KVM, it
>>> appears in system space. Got to cross-check that on my Core Duo.
>>>
>>
>> More data: it definitely seems to make a difference whether the VM's
>> desktop is showing. If I switch Gnome workspaces so it's not visible,
>> it doesn't seem to drive the frequency up.
>>
>>
>
> This just happened to me. I noticed that if I switch the workspace
> using alt-ctrl-left while the qemu window is active, qemu hangs. On
> the other hand, if I switch using the mouse, or while some other
> window is active, everything is fine. The qemu code even explains
> this as an sdl bug.
>
> Jingle any bells?

I'm afraid not, sorry. I stopped noticing the effect since I upgraded
to Ubuntu Hardy, although I admit I've stopped looking for it.

--
Dave Abrahams
BoostPro Computing