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Re: [Xen-users] How can you tell if NUMA is turned on in the Hypervisor?

  • To: deshantm@xxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Jeff Lane" <sundowner225@xxxxxxxxx>
  • Date: Thu, 1 May 2008 11:57:03 -0400
  • Delivery-date: Thu, 01 May 2008 09:04:52 -0700
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On Thu, May 1, 2008 at 10:54 AM, Todd Deshane <deshantm@xxxxxxxxx> wrote:

>  Can you (or someone) try running the xm info command it?
>  Or does somebody know if these multi-node IBM systems are NUMA or not?

They are... x3950, x3850, x3950M2, x3800 are all NUMA enabled systems.

>   I have a few of those used for test... a
>  >  couple are 2 node machines, while one is an 8 node.  That's the
>  >  biggest reason for needing NUMA, as anything (Xen or not) running on
>  >  multi-noded systems runs better with NUMA :-)
>  >
>  Have you done any benchmarking that shows this? Any papers or
>  references that confirm it?

No... not really.  It's more of an ... empirical observation than
anything else.  I've just noticed that when running guests on these
systems, and you also have to keep in mind that I am doing this using
beta level RHEL and SLES code with their respective patched Xen

One thing I noticed just by observation using these OSs and Xen is
that HVM guests tend to run a LOT slower or seem to have more issues
that para-virt guests.  I have also noticed that when using NUMA, the
HVM guests seem remarkably more responsive, just from a user

But it's all just by observation... I'm not so much concerned with
overall performance and benchmarking as I am with stability and
finding out whether or not these things simply work.

If that makes any sense.

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