Re: [Xen-devel] [PATCH 03 of 10 v3] xl: add more NUMA information to `xl info -n'

[Dario Faggioli <raistlin@xxxxxxxx>]

On Fri, 2012-07-06 at 12:37 +0100, Ian Campbell wrote: 
> > xl: add more NUMA information to `xl info -n'
> > 
> > So that the user knows how much memory there is on each node and
> > how far they are from each others.
> > 
> > Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> > Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> On my single node system this produces:
>         cpu_topology           :
>         cpu:    core    socket     node
>           0:       0        0        0
>           1:       1        0        0
>           2:       2        0        0
>           3:       3        0        0
>         numa_info              :
>         node:    memsize    memfree    distances
>            0:      4608       3083      10
> 
> Is "distances" here right? 
>
It looks the same here. While with two nodes it gives something like the
below:

     0:  1:
  0: 10, 20
  1: 20, 10

More important, forgetting about the '10' do you want me to suppress
that part of the output if there's only one node? I did not think at it
before, but it might make sense. Of course, I can also do this with a
follow-up patch, just let me know.

> I'd have expected only a single 0 (distance
> from self)?
> 
Honestly, I've not looked at where it comes from... I think I've seen
something similar in Linux as well (although I might be wrong).

Do you want me to investigate?

Thanks,
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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