Re: [Xen-devel] Xen 3.4.1 NUMA support

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 09/11/2009 15:19, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>>> Andre Przywara <andre.przywara@xxxxxxx> 09.11.09 16:02 >>>
>> BTW: Shouldn't we set finally numa=on as the default value?
> 
> I'd say no, at least until the default confinement of a guest to a single
> node gets fixed to properly deal with guests having more vCPU-s than
> a node's worth of pCPU-s (i.e. I take it for granted that the benefits of
> not overcommitting CPUs outweigh the drawbacks of cross-node memory
> accesses at the very least for CPU-bound workloads).

If this would be fixed (e.g., turn off node locality entirely by default for
domains which will not fit into a single node) then I think we could
consider numa=on by default.

 -- Keir



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