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Re: [Xen-devel] [PATCH 1 of 3 v5/leftover] libxl: enable automatic placement of guests on NUMA nodes [and 1 more messages]

  • To: Andre Przywara <andre.przywara@xxxxxxx>
  • From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • Date: Wed, 18 Jul 2012 15:54:43 +0200
  • Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxx>, Dario Faggioli <raistlin@xxxxxxxx>
  • Delivery-date: Wed, 18 Jul 2012 13:55:09 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xen.org>

Am 18.07.2012 15:40, schrieb Andre Przywara:
On 07/18/2012 01:00 PM, Ian Jackson wrote:
Ian Campbell writes ("Re: [PATCH 1 of 3 v5/leftover] libxl: enable
automatic placement of guests on NUMA nodes [and 1 more messages]"):
On Wed, 2012-07-18 at 10:43 +0100, Dario Faggioli wrote:
What could be done is restricting automatic placement to guests that
fits on 4 or 8 nodes for 4.2.

8 would mean on a 32 node system considering 10,518,300 combinations?

4 would mean on a 32 node system considering 35,960 combinations? On a
64 node system it would mean 635,376 combinations.

If that's the case then lets go with 4 as the limit for 4.2.0.

What is the maximum number of NUMA nodes we might expect to see on a
single system in the next five years? I would argue that 32 is too
optimistic. 128 or 256 seem like more reasonable upper bounds.

Wow, what are you talking about?
To calm this down from the AMD side:
The current Opteron NUMA architecture is limited to exactly 8 nodes.
This has ever been the case since the release of Opteron and changing
this is not trivial and will not happen in any near future. In general I
don't think we will see much bigger NUMA systems, but more cluster like

Maybe Juergen can comment on the Fujitsu side.

I'm not aware of anything with more than 8 nodes. OTOH I'm in the SW
department. I'm not sure I would hear about a larger machine long before
it is announced in public. :-)


Juergen Gross                 Principal Developer Operating Systems
PDG ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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