Re: [Xen-devel] [Hackathon minutes] PV frontends/backends and NUMA machines

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Tue, May 21, 2013 at 9:47 AM, George Dunlap
<George.Dunlap@xxxxxxxxxxxxx> wrote:
> On Tue, May 21, 2013 at 9:32 AM, Tim Deegan <tim@xxxxxxx> wrote:
>> At 14:48 +0100 on 20 May (1369061330), George Dunlap wrote:
>>> So the work items I remember are as follows:
>>> 1. Implement NUMA affinity for vcpus
>>> 2. Implement Guest NUMA support for PV guests
>>> 3. Teach Xen how to make a sensible NUMA allocation layout for dom0
>>
>> Does Xen need to do this?  Or could dom0 sort that out for itself after
>> boot?
>
> There are two aspects of this.  First would be, if dom0.nvcpus <
> host.npcpus, to place the vcpus reasonably on the various numa nodes.

And indeed, if dom0.nvcpus < host.nnodes, to try to minimize the
distance from the vcpus to all nodes on the system.

 -George

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