Please look at the NUMA feature to enable you to pin a VM to a CPU group.

Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109

Tel : +972 (9) 7692306
        8272306
Email: ydary@redhat.com
IRC : ydary

On Mon, Feb 1, 2016 at 9:21 AM, David Jorm <djorm@iix.net> wrote:

Hi All

Thanks for the help that people have recently provided on this list.
I'm running into another edge case that, as far as I can see, does not
have a native solution within oVirt. I have a use case where every VM
must have 4 pinned vCPUs, and these must map 1:1 to physical CPUs so
that there are never two VMs contending for the same physical cores. I
already have code in place that ensures a VM will not be created or
started if n/4 VMs are already running on the target host, where n is
the number of physical cores. What I need now is to ensure that
pinning is managed so that each physical core maps 1:1 to vCPUs.

Would it be possible to manage the pool of physical cores in a local
DB, and implement a VDSM hook similar to the example on this page?

http://www.ovirt.org/VDSM-Hooks

Or would there be a preferable solution?

Thanks
David
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