Open Stack

----- Original Message -----
> From: "Brent Troge" <brenttroge2016 at gmail.com>
> To: openstack at lists.openstack.org
> Sent: Friday, July 8, 2016 9:59:58 AM
> Subject: [Openstack] vCPU -> pCPU MAPPING
> 
> context - high performance private cloud with cpu pinning
> 
> Is it possible to map vCPUs to specific pCPUs ?
> Currently I see you can only direct which vCPUs are mapped to a specific
> NUMA node
> 
> hw:numa_cpus.0=1,2,3,4

Just in addition to Jay's comment, the above does not do what I suspect you think it does. The above tells Nova to expose vCPUs 1, 2, 3, and 4 in *guest* NUMA node 0 when building the guest NUMA topology in the Libvirt XML. Nova will endeavor to map these vCPUs to pCPUs on the same NUMA node on the host as *each other* but that will not necessarily be NUMA node *0* on the host depending on resource availability.

Thanks,

Steve

> However, to get even more granular, is it possible to create a flavor which
> maps vCPU to specific pCPU within a numa node ?
> 
> Something like:
> hw:numa_cpus.<NUMA-NODE>-<pCPU>=<vCPU>
> 
> hw:numa_cpus.0-1=1
> hw:numa_cpus.0-2=2
> 
> 
> Thanks!
> 
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