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

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] dom0-cpus problem with Xen 3.4.1-rc6
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 22 Jul 2009 18:46:00 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Nerijus Narmontas <n.narmontas@xxxxxxxxx>
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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.

 -- Keir

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