RE: [Xen-devel] Xen 3.4.1 NUMA support

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx> 10.11.09 02:46 >>>
>> >>> 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).
>
>What default confinement? I thought guests had an all-pCPUs affinity mask be 
>default?

Not with numa=on (see also Andre's post to this effect): The guest will
get assigned to a node, and its affinity set to that node's CPUs.

Jan


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