[openstack-hpc] NUMA config

Steve Gordon sgordon at redhat.com
Wed Apr 29 15:12:54 UTC 2015


Adding Dan and Nikola as I doubt they are on this list, guys this is in reference to this devref example which looks a little off:

http://docs.openstack.org/developer/nova/devref/testing/libvirt-numa.html#testing-instance-boot-with-1-numa-cell-requested

----- Original Message -----
> From: "Blair Bethwaite" <blair.bethwaite at gmail.com>
> To: "Pradeep Kiruvale" <pradeepkiruvale at gmail.com>
> Cc: openstack-hpc at lists.openstack.org
> Sent: Wednesday, April 29, 2015 10:33:31 AM
> Subject: Re: [openstack-hpc] NUMA config
> 
> On 29 April 2015 at 18:50, Pradeep Kiruvale <pradeepkiruvale at gmail.com>
> wrote:
> > I think it creates 2 Virtual NUMA nodes on one single Physical NUMA node
> > If you see below cpu 0-1 are in one NUMA node and 2-3 are in the other.
> > This is what I can understand from the xml.
> >
> >  <numa>
> >    <cell id='0' cpus='0-1' memory='524288'/>
> >    <cell id='1' cpus='2-3' memory='524288'/>
> >  </numa>
> 
> Yeah, but that doesn't seem to be consistent with this from the same section:
> "nova flavor-key m1.numa set hw:numa_nodes=1"
> According to the spec
> (http://specs.openstack.org/openstack/nova-specs/specs/juno/implemented/virt-driver-numa-placement.html):
> hw:numa_nodes=NN - numa of NUMA nodes to expose to the guest.
> Not to mention the numatune config that binds the guest nodes to host nodes.
> 
> An aside: Does anyone else find it strange that all these options are
> designed to be flavor and/or image extra specs rather than providing a
> mechanism to set them on instance boot (e.g. hints). I think the
> relationship between flavors or images and such tunables is tenuous at
> best, why should I need multiple versions of what is otherwise the
> same image or flavor in order to ask for e.g. CPU pinning or Qemu
> guest agent, these are per instance tunables.
> 
> --
> Cheers,
> ~Blairo
> 
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> 

-- 
Steve Gordon, RHCE
Sr. Technical Product Manager,
Red Hat Enterprise Linux OpenStack Platform



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