From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Theurer Subject: Re: CPU Utilization Date: Mon, 12 Dec 2005 21:23:56 -0600 Message-ID: <439E3ECC.8090302@us.ibm.com> References: <5440A5A36B8CED4B9F54524343CB6B68FD1467@xmb-rtp-215.amer.cisco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <5440A5A36B8CED4B9F54524343CB6B68FD1467@xmb-rtp-215.amer.cisco.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Dave Thompson (davetho)" Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Dave Thompson (davetho) wrote: > > > > >>-----Original Message----- >>From: Anthony Liguori [mailto:aliguori@us.ibm.com] >>Sent: Monday, December 12, 2005 5:01 PM >>To: Dave Thompson (davetho) >>Cc: Rob Gardner; xen-devel@lists.xensource.com >>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 > >