From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <raistlin@linux.it>
Subject: Re: [PATCH 1 of 3 v5/leftover] libxl: enable automatic
 placement of guests on NUMA nodes
Date: Fri, 20 Jul 2012 12:01:25 +0200
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To: Andre Przywara <andre.przywara@amd.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>, George Dunlap <george.dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Juergen Gross <juergen.gross@ts.fujitsu.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, xen-devel <xen-devel@lists.xen.org>
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On Fri, 2012-07-20 at 11:39 +0200, Dario Faggioli wrote:
> > If we somehow determine that this approach doesn't work (no nodes with=
=20
> > enough free memory or more vCPUs than CPUs-per-node) we should use the=
=20
> > sophisticated algorithm.
> >=20
> And again, you'll see the new code and will tell me what you think
> later, but I really think I turned it into something like that. The only
> thing=20
>=20
Some text got cut here.

What I wanted to ask is what you think we should do with guests that
have more vcpus than pcpus of a node. Right now, as I do for memory, I'm
using it as a reason to consider candidates with more than one node.
XenD did something similar, as it adds nodes (although it does that
afterwords) until the above stop being true.

Should we ignore that and stick to the number of nodes that gives us
enough memory? Should we do that but only up to a certain extent (e.g.,
by asking for a candidate to have at least half pcpus as the domain has
vcpus)? After all, even if we give the domain enough pcpus, he's not
going to have exclusive access to them anyway...

Again, just random thought seeking for a confirmation that is very hard
to find! :-)

Thanks and Regards,
Dario

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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