[fedora-virt] Where can I find information on pinning the host os to a cpu set in RHEL6?

[Eric Blake]

On 12/01/2010 02:41 PM, Richard W.M. Jones wrote:
> On Wed, Dec 01, 2010 at 02:11:34PM +0100, Henry Pepper wrote:
>> Hi
>>
>> I'm trying to find out how I can pin the host OS to a cpu set, e.g.
>> cpu0 on RHEL6.
>>
>> On Xen I simply pin the Domain-0 to a cpu set.
>>
>> But I don't seem to be able to identify the host OS in RHEL6/KVM.
> 
> Unlike Xen, the host isn't a special sort of guest.  The host is the
> host, and so you just use standard Linux techniques.
> 
> The way I know to do this is to add "isolcpus=..." on the Linux boot
> command line, although I've not used this for quite a long time and I
> haven't tried it on RHEL 6.
> 
> isolcpus works in reverse: it's the CPUs that you want Linux *not* to
> run on, so you probably want something like isolcpus=1-3

libvirt also has an XML notation for cpu pinning; it is part of the
<vcpu> element, documented
http://libvirt.org/formatdomain.html#elementsResources (although
admittedly the libvirt documentation could use more examples).

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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