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Re: [Xen-devel] [PATCH 0 of 8] NUMA Awareness for the Credit Scheduler

On Tue, Oct 09, 2012 at 11:45:49AM +0100, Dario Faggioli wrote:
> Whether, that is acceptable or not, is of course debatable, and we had a
> bit of this discussion already (although no real conclusion has been
> reached yet).
> My take is that, right now, since we do not yet expose any virtual NUMA
> topology to the VM itself, the behaviour described above is fine. As
> soon as we'll have some guest NUMA awareness, than it might be
> worthwhile to try to preserve it, at least to some extent.

For what it's worth, under VMware all bets are off if a vNUMA enabled
guest is migrated via vMotion. See "Performance Best Practices for
VMware vSphere 5.0" [1] page 40. There is also a good deal of
information in a paper published by VMware labs on HPC workloads [2]
and a blog post on NUMA load balancing [3].


[1] http://www.vmware.com/pdf/Perf_Best_Practices_vSphere5.0.pdf
[3] http://blogs.vmware.com/vsphere/2012/02/vspherenuma-loadbalancing.htmlvnu

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