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Re: [Xen-devel] Xen 3.4.1 NUMA support

To: "Andre Przywara" <andre.przywara@xxxxxxx>, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx>
Subject: Re: [Xen-devel] Xen 3.4.1 NUMA support
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: Mon, 09 Nov 2009 15:19:12 +0000
Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Papagiannis Anastasios <apapag@xxxxxxxxxxxx>
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>>> 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).


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