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

Avi Kivity
2008-07-06T12:13:41Z

[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?

--
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