Re: NUMA TODO-list for xen-devel

[Dario Faggioli <raistlin@linux.it>]

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On Fri, 2012-08-03 at 12:02 +0200, Andre Przywara wrote:
> On 08/01/2012 06:16 PM, Dario Faggioli wrote:
> > ...
> >
> >         * automatic placement of Dom0, if possible (my current series is
> >           only affecting DomU)
> 
> I think Dom0 NUMA awareness should be one of the top priorities. If I 
> boot my 8-node box with Xen, I end up with a NUMA-clueless Dom0 which 
> actually has memory from all 8 nodes and thinks it's memory is flat.
>
Ok, I updated the Wiki page with a link to this (sub)thread --- more
specifically, the mails where we agree about the new syntax. I can work
on it, but not in the next few days, so let's see if anyone steps up
before I get to look at it. :-)

> > [D] - NUMA aware scheduling in Xen. Don't pin vcpus on nodes' pcpus,
> >        just have them _prefer_ running on the nodes where their memory
> >        is.
> 
> This would be really cool. I once thought about something like a 
> home-node. We start with placement to allocate memory from one node. 
> Then we relax the VCPU-pinning, but mark this node as special for this 
> guest, so that it if possible happens to get run there. But in times of 
> CPU pressure we are happy to let it run on other nodes: CPU starving is 
> much worse than NUMA penalty.
> 
Yep. Patches coming soon.

Thanks and Regards,
Dario

-- 
<<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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