[Openstack-operators] pci passthrough & numa affinity

Jonathan D. Proulx jon at csail.mit.edu
Thu May 24 22:19:09 UTC 2018

On Fri, May 25, 2018 at 07:59:16AM +1000, Blair Bethwaite wrote:
:Hi Jon,
:Following up to the question you asked during the HPC on OpenStack
:panel at the summit yesterday...
:You might have already seen Daniel Berrange's blog on this topic:
:? He essentially describes how you can get around the issue of the
:naive flat pci bus topology in the guest - exposing numa affinity of
:the PCIe root ports requires newish qemu and libvirt.

Thanks for the pointer not sure if I've seen that one, I've seen a few
ways to map manually.  I would have been quite surprised if nova did
this so I am poking at libvirt.xml outside nova for now

:However, best I can tell there is no way to do this with Nova today.
:Are you interested in working together on a spec for this?

I'm not yet convinced it's worth the bother, that's the crux of the
question I'm investigating.  Is this worth the effort?  There's a meta
question "do I have time to find out" :)

:The other related feature of interest here (newer though - no libvirt
:support yet I think) is gpu cliques
:would be really nice to have a way to set these up through Nova once
:libvirt supports it.


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