Re: [Xen-users] vcpus questions!

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> > Is there a maximum number of vcpus that I can load?
> > How porcentage each vcpus get of the physical CPU ? And how
> > can I configure it?
>
> You should be able to use more than 8 VCPU's in one guest - however, you
> can't use more VCPU's at any given time than the number of physical
> cores in the machine, so to run more than 8 VCPU's at once, you need
> something like a
> 4-socket machine with quad-core processors or 8-socket machine with dual
> core processors (or 16 socket machine with single core processors)
> [assuming we take the standard 2^n processor configurations - of course
> there are several permutations of odd-number sockets that would also
> allow more than 8 VCPU's].

To clarify, AFAIK you can allocate a domU (nb. not dom0 last time I heard) 
more VCPUs than there are host logical CPUs, it's just not a good idea 
performance-wise.

Cheers,
Mark

> Note that also some OS's have limits of how many CPU's they allow in any
> particular distribution/configuration, so this may also limit the number
> of CPU's actively working.
>
> --
> Mats
>
> > Thanks!
> >
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-- 
Dave: Just a question. What use is a unicyle with no seat?  And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!

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