Re: [Xen-ia64-devel] problems with smp

["David Brown" <dmlb2000@xxxxxxxxx>]

>    All of the CPUs exposed to dom0 and domUs are virtual CPUs.  Xen
> schedules virtual CPUs across the physical CPUs just like a bare metal
> OS schedules processes across physical CPUs.  The xm top output shows
> vCPU processor usage across all the vCPUs in a domain.  The CPU% shown
> is the percentage of physical CPU time taken.  So 100% means the domain
> is consuming all the time of one physical CPU.  A 4-way domain might
> consume up to 400%.  One vCPU cannot consume more than one physical CPU,
> so if you have less vCPUs (across all domains) than you do pCPUs, then
> you won't be able to fully utilize the extra pCPUs.  Does that help?
> Thanks,
Yes, thanks.

So, my dual itanium 2 box running dom0 and 8 domU's, and xm top is
showing that the dom0 and one of the domU's are using %40 each and the
other 7 domU's are showing <10% (this almost sounds like a high school
math problem ;)) is not actually maxed out... there's a slowdown
somewhere else in the system then because really adding up the
percentages should equal to 200% if the processors were maxed out.

At least that's what I think is going on...

- David Brown

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