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Re: [Xen-users] CPU's vs. VCPUS

from [Mehdi AMINI]

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To:	"matthewh" <matt@xxxxxxxxxxxxx>
Subject:	Re: [Xen-users] CPU's vs. VCPUS
From:	"Mehdi AMINI" <armeni67@xxxxxxxxxxx>
Date:	Wed, 3 Oct 2007 09:55:06 +0200 (CEST)
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Hello,

> I would
> however, like to run a single domU domain, with a single VCPU, but get the
> power of say, 7 cores, leaving 1 to the dom0 instance. First off, I would
> like to know if this is possible.
>


No it's imppossible : multiples cpus means parallelization, so the
scheduler of the guest OS has to be aware of each cpus.

1 vcpu = 1 hardware thread.



> In my config file I have specified cpus = "1-7" and vpus=1 in the hope
> that
> the 1 vcpu would be an almighty powerful one, but this isn't the case.


This mean that your vcpus can use one of the 1-7 cpus, and not the 0 one.
But only one at a time.



Mehdi


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