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RE: [Xen-devel] vcpu-pin ?

To: "Nicholas Lee" <emptysands@xxxxxxxxx>, "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] vcpu-pin ?
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Thu, 13 Oct 2005 11:09:27 +0100
Cc: Ryan Harper <ryanh@xxxxxxxxxx>, Ewan Mellor <ewan@xxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] vcpu-pin ?
 
> I'm I reading this as meaning a single VCPU domain can be 
> switch from one 'real' CPU to another and back again?
> 
>   vcpu-pin <DomId> <VCpu> <CPUS>    set which cpus a VCPU can use.

SMP domains have multiple VCPUs, so you can specify which VCPU the pin
operation refers to.

The CPUs parameter can actually be a list of eligible physical CPUs.

[NB: I'm actually not sure how useful this command is -- its probably
easier from a user point of view to specify a set of physcial CPUS for a
domain, and have eiher xen or xend allocate VCPUs to eligible physical
CPUs]

Ian

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