20% cpu usage spikes with idle centos 5.3 guest on F11

[Dennis Jacobfeuerborn]

Hi,
When I run a centos 5.3 x86_64 guest on my F11 x86_64 system with kvm I see 
the qemu-kvm process cpu usage jump to ~20% every few seconds even though 
the guest is completely idle (I even disabled the HAL polling for 
/dev/hdc). Does anyone have an idea what could be the cause of this or how 
find the reason for this behavior?

Regards,
   Dennis

[Jerry James]

On Wed, Jun 24, 2009 at 7:38 PM, Dennis J.<dennisml(a)conversis.de> wrote:
>  Hi,
>  When I run a centos 5.3 x86_64 guest on my F11 x86_64 system with kvm I see
>  the qemu-kvm process cpu usage jump to ~20% every few seconds even though
>  the guest is completely idle (I even disabled the HAL polling for /dev/hdc).
>  Does anyone have an idea what could be the cause of this or how find the
>  reason for this behavior?
>
>  Regards,
>   Dennis 
Interesting.  I also have an x86_64 CentOS 5.3 guest running under an
x86_64 F11 host.  But I don't see those spikes.  What I see is a
constant, apparently very steady 12% CPU usage when the guest is idle.
 I have not disabled /dev/hdc polling.

My guest has 1 GB of RAM and 2 virtual CPUs, if that matters.  I've
also messed with xorg.conf to increase the resolution slightly.
Otherwise, it is a vanilla virt-manager created VM.
-- 
Jerry James
http://www.jamezone.org/

[Alexander Boström]

Den 2009-06-25 17:16, Jerry James skrev:

>  Interesting.  I also have an x86_64 CentOS 5.3 guest running under
> an
>  x86_64 F11 host.  But I don't see those spikes.  What I see is a
>  constant, apparently very steady 12% CPU usage when the guest is idle. 
It might help to remove the virtual sound card, I think.

/abo