Re: [Xen-devel] multi-processor odd behavior?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18 Nov 2005, at 16:32, John L Griffin wrote:

> This seems to indicate that one CPU is being reserved entirely for 
> dom0,
> even when dom0 isn't using it to capacity?  (That doesn't seem like the
> intended behavior.)  Do I have a configuration option set wrong?  Or is
> this a known issue?  Or, is it fixed in the latest builds?
The tools statically round-robin allocate vcpus to physical cpus as 
they are created, but there is currently no dynamic load balancing. So 
if your two guests happen to get allocated to the same pcpu, they will 
each get half a cpu even if other physical cpus are idling.
We have a prototype load balancer that we may check in after cleaning 
up and testing. An alternative, or perhaps complementary, approach is 
to implement 'take' scheduling (idle cpus steal work from loaded cpus).
 -- Keir


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