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xen-devel
Re: [Xen-devel] CPU Utilization
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
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