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Re: [Xen-devel] CPU Utilization

To: "Dave Thompson (davetho)" <davetho@xxxxxxxxx>
Subject: Re: [Xen-devel] CPU Utilization
From: Andrew Theurer <habanero@xxxxxxxxxx>
Date: Mon, 12 Dec 2005 21:23:56 -0600
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Dave Thompson (davetho) wrote:



-----Original Message-----
From: Anthony Liguori [mailto:aliguori@xxxxxxxxxx] Sent: Monday, December 12, 2005 5:01 PM
To: Dave Thompson (davetho)
Cc: Rob Gardner; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] CPU Utilization

top isn't smart enough to realize that for a portion of the running time, a domain has been pre-empted out and is not running.

top will then charge whatever was running at pre-emption time for the time that other domain running.

But what else is running?  In this case I only have dom0 configured,
there is no domU.  The only other possibility would be the hypervisor
and I hope the hypervisor is not accounting for the other 30%.
If xend is started, you may have the software bridge running which can use as much as 10% cpu. Also, I don't see soft ints in that top output. That could also be another ~7% cpu. Also xen is doing some work, receiving the real interrupts and generating virtual interrupts to dom0, so with all this, it is possible that you are using another 30% unseen in top. Best way to confirm this would be to use xenoprofile.

-Andrew




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