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Re: [Xen-devel] RFC: Still TODO for 4.2? xl domain numa memory allocation vs xm/xend


  • To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
  • From: Dario Faggioli <raistlin@xxxxxxxx>
  • Date: Fri, 20 Jan 2012 18:32:48 +0100
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Keir \(Xen.org\)" <keir@xxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "Tim \(Xen.org\)" <tim@xxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
  • Delivery-date: Fri, 20 Jan 2012 17:35:42 +0000
  • Face: 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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

On Fri, 2012-01-20 at 16:54 +0000, Ian Campbell wrote: 
> I confused myself into thinking that cpupools ~= NUMA because I've only
> used cpupool-numa-split but I can see that you might also divide your
> cpus up some other way.
> 
Yeah, indeed, although the numa-split case looks like the most useful
one to me.

> Should that same union be used for d->node_affinity though? It seems
> like it would make sense.
> 
According to me, it should. Then, at least right now, moving it would
probably kill its performances because all its memory will be far away,
while right now it's all more "stochastic".

Still, I think it should be done, as if you place a domain in a cpupool
at its creation, I think the case of moving it away from there would be
quite rare.

Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-------------------------------------------------------------------
Dario Faggioli, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
PhD Candidate, ReTiS Lab, Scuola Superiore Sant'Anna, Pisa (Italy)


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