Re: Spurious "NUMA placement failed, performance might be affected" message on ARM

[Dario Faggioli <dario.faggioli@citrix.com>]

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On lun, 2014-04-28 at 12:30 +0100, Ian Campbell wrote:
> On Mon, 2014-04-28 at 11:01 +0100, Ian Campbell wrote:
> [...]
> > total_memory           : 8184
> > free_memory            : 6933
> [...]
> > node:    memsize    memfree    distances
> >    0:      4088       3861      20
> 
> I think we are missing some RAM here...
> 
> and I have now noticed that I only see this for guests which have more
> RAM than this memfree value (+/- some slop). The guests succeed because
> there is actually RAM available.
> 
Oh, yes, that's the first 'if' being true then.

Anyway, I'll go ahead and make a patch for skipping all this in case
there is only 1 node.

> I think this is enough for me to now track down the cause on the
> hypervisor side. 
>
Indeed. From what you say, it looks like XEN_SYSCTL_numainfo is 'hiding'
something on ARM...

> Thanks for your input.
> 
:-)

Regards,
Dario

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


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