Re: [Xen-devel] CPU Utilization

Rob Gardner
Mon, 12 Dec 2005 21:10:53 -0000

>Doesn''t top''s CPU summary line show both?  I thought
us=user space,
>sy=system, ni=nice, id=idle, hi=hwintr, si=softintr.  So in my
>example 1% in user space, 7.3% in system level, 3.3% in h/w intr,
>and 15% in soft intr.  Total of 26.6% utilized of which 25.6% is
>in kernel.
>
>
>

I think that ''top'' shows system time spent on behalf of user
processes.
Dom0 has stuff going on in the kernel that has nothing to do with user
processes. For instance, when you generate lan traffic to/from another
domain, it causes the dom0 kernel to use a bunch of cpu time, and this
may not show up using ''top''. That''s my guess about
what is happening.

Rob