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Re: [Xen-users] default CPU for 2nd domain...

from [Mark Williamson]

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Subject:	Re: [Xen-users] default CPU for 2nd domain...
From:	Mark Williamson <mark.williamson@xxxxxxxxxxxx>
Date:	Thu, 25 Aug 2005 19:23:36 +0100
Cc:	Tom Brown <tbrown@xxxxxxxxxxxxx>, Stephan Diestelhorst <Stephan.Diestelhorst@xxxxxxxxxxxx>, David <xendev@xxxxxxxxxxxxxx>
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>  > The default CPU for the first domU is wrong for SMP machines. Dead wrong
>  > if there are only the two domains.  dom0 and the first domU end up on
>  > hyperthreads of the first CPU. At least under 2.0.5 ....

Default allocation is already smarter under 3.0-unstable.

>  > and I frankly 
>  > didn't realize that XEN doesn't seem to move domains between "CPUs".
>  > Once a domain has been assigned a "CPU" it is stuck there until/unless
>  > someone moves it with "xm pincpu"

Yep.

>  > You can have two busy dom's sharing one CPU and the other CPU
>  > effectively idle. I hope and believe this will be fixed under 3.0 ?
>
> Does anybody know for certain if 3.0 will have a more intelligent CPU
> balancing system?

It will; in addition to the improved default allocation already available 
Stephan has code that tries to move vCPUs around in order to optimise the 
performance of the machine.

Cheers,
Mark

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