Re: [Xen-devel] [PATCH 1 of 3] libxl: take node distances into account during NUMA placement

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 19 Oct 2012, Dario Faggioli wrote:
> > Suppose we get an ARM system with 4096 cores and 128 NUMA
> > nodes?  If Xen 4.4 doesn't come out until March 2014, there will still
> > be distros using 4.3 through mid-2015.
> > 
> Right, but I really don't think that monster is actually made out of
> 4096 cores arranged in 128 _NUMA_ nodes on which you run the same
> instance of the hypervisor.

In fact it does not. It would be 4096 cores arranged in 1024 nodes, each
node completely independent from one another.


> I also recall hearing the numbers and the use of the word "node", but I
> really think they was rather referred to a cluster architecture where "a
> node" means something more like "a server", each one running their copy
> of Xen (although they'll be packed all together in the same rack,
> talking via some super-fast interconnect).

Exactly right.


> I'm pretty sure I remember Stefano speculating about the need to use
> some orchestration layer (like {Cloud,Open}Stack) _within_ those big
> irons to deal exactly with that... Stefano, am I talking nonsense? :-D

Nope, all true.

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