Re: kvm somehow exempt from frequency scaling?

David Abrahams
2007-04-10T04:24:48Z

on Mon Apr 09 2007, Avi Kivity <avi-AT-qumranet.com> wrote:

> David Abrahams wrote:
>> I'm using the ondemand governor on my core duo laptop. Even when kvm
>> is taking 99% of the CPU, somehow instead of the ondemand governor
>> kicking it up to 2GHz, the CPU is still running at half speed. What's
>> up with that? Anybody know?
>>
>>
>
> Strange. Does a simple bash busy-loop (while :; do :; done) work?

The frequency goes up to 1.67Ghz.

I've seen it happen that the CPU is pegged at 100% in the WinXP Guest
OS's task manager with my frequency scaling never hitting the max of
2.17 Ghz. Right now I'm see variable CPU load on the guest averaging
around 75%, and it does cause frequency scaling to hit the max every
once in a while.

--
Dave Abrahams
Boost Consulting