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Re: [Xen-users] load balance w/multiple processors?

from [Mark Williamson]

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Subject:	Re: [Xen-users] load balance w/multiple processors?
From:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date:	Wed, 29 Jun 2005 15:31:54 +0100
Cc:	Dave Alden <alden@xxxxxxxxxxxxxxxxxxx>
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>   I've got a couple of dual-core dual-processor Opteron boxes that I'm
> thinking about running xen on.

Waaaaa!  Mathematicians have better machines than me.  :-)

> From my testing so far, it looks to me 
> that once a domain has been assigned to a particular processor, it will
> only use that processor, even if one of the other processors is idle.
> Is this correct?  If so, is this something that is being worked on?

Yes.  Xen 3.0 will allow multiprocessor guests.  Also, a domain load balancer 
is being worked on that'll automatically repin guests to other CPUs.  I guess 
that'll end up in 3.0 too...

In the meantime, the best you can do is to do a coarse grained manual "repin" 
when your system load changes significantly.

Cheers,
Mark

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