RE: [Xen-devel] [RFC] Xen NUMA strategy

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> Ian Pratt wrote:  [Tue Sep 18 2007, 04:43:24AM EDT]
> > The way I see it, in most situations it will not make sense for
guests
> > to span NUMA nodes: you'll have a number of guests with relatively
small
> > numbers of vCPUs, and it probably makes sense to allow the guests to
be
> > pinned to nodes. What we have in Xen today works pretty well for
this
> > case, [snip]
> 
> One part that doesn't work well presently is memory locality.  A guest
> can be pinned to a CPU but its allocated memory might be on a distant
> node...

If the guest's VCPUs were pinned to a particular node (or nodes) at the
time the domain was created or additional memory was allocated to it,
then the memory *will* be allocated from the right node(s). If you have
a domain CPU mask that covers multiple nodes, memory will be 'striped'
across the nodes.

Ian

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