XP smp using a lot of CPU

[Johannes Schlatow <johannes.schlatow@gmx.de>]

I had a similar problem some weeks ago. Finally I found out that my VM
running WinXP was working on a non-acpi system (maybe I started kvm
with -no-acpi option during the installation). In the Device Manager
there has to be the entry Computer->"ACPI Multiprocessor PC".
Otherwise the VM produced 100% real cpu load on my machines (the fans
were running on highest speed level).
I just started the WinXP installation in repair mode and this did fix
the problem.

I hope this helps!

regards
  Johannes

On Wed, May 13, 2009 at 2:41 AM, Ross Boylan <ross@biostat.ucsf.edu> wrote:
>
> I just installed XP into a new VM, specifying -smp 2 for the machine.
> According to top, it's using nearly 200% of a cpu even when I'm not
> doing anything.
>
> Is this real CPU useage, or just a reporting problem (just as my disk
> image is big according to ls, but isn't really)?
>
> If it's real, is there anything I can do about it?
>
> kvm 0.7.2 on Debian Lenny (but 2.6.29 kernel), amd64.  Xeon chips; 32
> bit version of XP pro installed, now fully patched (including the
> Windows Genuine Advantage stuff, though I cancelled it when it wanted to
> run).
>
> Task manager in XP shows virtually no CPU useage.
>
> Please cc me on responses.
>
> Thanks for any assistance.
> --
> Ross Boylan                                      wk:  (415) 514-8146
> 185 Berry St #5700                               ross@biostat.ucsf.edu
> Dept of Epidemiology and Biostatistics           fax: (415) 514-8150
> University of California, San Francisco
> San Francisco, CA 94107-1739                     hm:  (415) 550-1062
>
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