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[Xen-users] Re: [Xen-devel] dom0-cpus problem with Xen 3.4.1-rc6

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: [Xen-users] Re: [Xen-devel] dom0-cpus problem with Xen 3.4.1-rc6
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Wed, 22 Jul 2009 21:03:15 +0300
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Nerijus Narmontas <n.narmontas@xxxxxxxxx>
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On Wed, Jul 22, 2009 at 06:46:00PM +0100, Keir Fraser wrote:
> On 22/07/2009 18:29, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:
> >> dom0-cpus does the same as dom0_max_vcpus -- it specifies number of VCPUs
> >> which dom0 should run with. The difference is that dom0_max_vcpus=1 means
> >> that is all that dom0 kernel will detect and boot with: you cannot
> >> subsequently enable more. With (dom0-cpus 1), dom0 will boot with a vcpu 
> >> for
> >> every host cpu (by default) and then hot-unplug/offline all but one vcpu
> >> when xend starts. The latter is obviously a more complex operation, but
> >> could be reverted (i.e., you could online some of those vcpus at a later
> >> time).
> > 
> > Hmm, so 'dom0-cpus' in xend-config.sxp doesn't limit on what physical CPUs
> > the VCPUs of dom0 can run on?
> No, there's no way to configure affinity in the xend config file. You'd have
> to issue 'xm vcpu-pin' commands after xend is started.

Ok, thanks for clarifying that. I was already checking the xend-config.sxp
docs and figured out it's correctly written/described there.

-- Pasi

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