From: Rob Gardner <rob.gardner@hp.com>
To: "Dave Thompson (davetho)" <davetho@cisco.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: CPU Utilization
Date: Mon, 12 Dec 2005 12:23:19 -0700 [thread overview]
Message-ID: <439DCE27.3080807@hp.com> (raw)
In-Reply-To: <5440A5A36B8CED4B9F54524343CB6B68FD1300@xmb-rtp-215.amer.cisco.com>
Dave Thompson (davetho) wrote:
>I have a question concerning the CPU utilization number provided by
>the 'xm top' command in xen 3.0. I've noticed that if I run a TCP
>performance tool on domain 0 which simply receives and echos back
>a TCP stream, the output of 'xm top' during the test does not match
>up with the output of 'top' on domain 0 in terms of CPU utilization
>(nor with the CPU utilization computed by the test program).
>
>...
>
>Any idea why these displays disagree?
>
>
Top shows cpu usage for user processes in dom0, while xm top shows cpu
usage for the domain, which includes cpu time spent in the dom0 kernel.
Perhaps the thing you're running incurs lots of kernel cpu time, but not
user time?
Rob
next prev parent reply other threads:[~2005-12-12 19:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-12 19:07 CPU Utilization Dave Thompson (davetho)
2005-12-12 19:23 ` Rob Gardner [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-07-24 17:05 CPU utilization Vijay Khemka
2005-12-13 14:15 CPU Utilization Dave Thompson (davetho)
2005-12-13 15:35 ` Andrew Theurer
2005-12-12 23:19 Dave Thompson (davetho)
2005-12-13 3:23 ` Andrew Theurer
2005-12-12 19:41 Dave Thompson (davetho)
2005-12-12 21:10 ` Rob Gardner
2005-12-12 23:01 ` Anthony Liguori
2005-12-13 13:41 ` Rik van Riel
2005-10-04 23:59 Preethi M
2005-10-06 16:22 ` Rob Gardner
2005-05-01 13:51 CPU utilization Brian Hays
2005-05-01 17:14 ` Keir Fraser
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