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From: Avi Kivity <avi@redhat.com>
To: Ross Boylan <ross@biostat.ucsf.edu>
Cc: kvm@vger.kernel.org
Subject: Re: XP smp using a lot of CPU
Date: Wed, 13 May 2009 09:56:18 +0300	[thread overview]
Message-ID: <4A0A6F12.9000909@redhat.com> (raw)
In-Reply-To: <1242175298.15140.12.camel@iron.psg.net>

Ross Boylan 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.
>
>   

I'm guessing Windows uses a pio port to sleep, which kvm doesn't 
support.  Can you provide kvm_stat output?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


  parent reply	other threads:[~2009-05-13  6:58 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-05-13  0:41 XP smp using a lot of CPU Ross Boylan
2009-05-13  1:05 ` Elias Probst
2009-05-13  6:56 ` Avi Kivity [this message]
2009-05-14 14:10   ` Kevin Shanahan
2009-05-14 20:01   ` Ross Boylan
     [not found]     ` <20090515145651.GB6304@amt.cnet>
2009-05-15 15:41       ` Ross Boylan
2009-05-15 20:24         ` XP smp using a lot of CPU [SOLVED] Ross Boylan
2009-05-15 23:00           ` Brian Jackson
2009-05-13 20:23 ` XP smp using a lot of CPU Erik Rull
2009-05-17 21:35   ` Avi Kivity
2009-05-19 17:35     ` Erik Rull
2009-05-20 12:01       ` Avi Kivity
2009-05-20 20:00         ` Erik Rull
2009-05-24 11:42           ` Avi Kivity
2009-05-25 10:01             ` Erik Rull
2009-05-25 10:46               ` Avi Kivity
     [not found] ` <fupb74dtcl3kru3oo7UYAxe124vaj_firegpg@mail.gmail.com>
2009-05-14 10:25   ` Johannes Schlatow
2009-05-14 15:40   ` Ross Boylan

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