Re: [Xen-devel] Spurious "NUMA placement failed, performance might be affected" message on ARM

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-04-28 at 11:55 +0200, Dario Faggioli wrote:
> While I wonder why that does not happen on ARM, a sensible solution
> would be to bail earlier, if we find only one NUMA node exist, for
> whatever arch. Would that be ok? If yes, I can arrange a patch pretty
> easily, I think.

I suppose if ARM is also reporting 1 node then for some reason this
check isn't hitting and moving it earlier won't help (not that it would
be a bad idea independently to optimise this a bit).

Perhaps ARM is reporting no NUMA nodes? The xl info -n output suggests
not but where else should I check.

> 
> For figuring out why the different behavior... Do you have the output of
> `xl info -n' on that box handy, by any chance?

Here you are:

# xl info -n
host                   : marilith-n0
release                : 3.14.0-arm-native-10322-g0903f4b
version                : #6 SMP Thu Apr 17 14:03:36 BST 2014
machine                : armv7l
nr_cpus                : 4
max_cpu_id             : 127
nr_nodes               : 1
cores_per_socket       : 1
threads_per_core       : 1
cpu_mhz                : 150
hw_caps                : 
00000000:00000000:00000000:00000000:00000000:00000000:00000000:00000000
virt_caps              :
total_memory           : 8184
free_memory            : 6933
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
cpu_topology           :
cpu:    core    socket     node
  0:       0        0        0
  1:       0        0        0
  2:       0        0        0
  3:       0        0        0
numa_info              :
node:    memsize    memfree    distances
   0:      4088       3861      20
xen_major              : 4
xen_minor              : 5
xen_extra              : -unstable
xen_version            : 4.5-unstable
xen_caps               : xen-3.0-armv7l 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0x200000
xen_changeset          : Thu Apr 24 16:14:47 2014 +0100 git:499282e-dirty
xen_commandline        : console=dtuart dtuart=/soc/serial@fff36000 
dom0_mem=128M noreboot conswitch=x loglvl=all guest_loglvl_all
cc_compiler            : gcc (Debian 4.6.3-14) 4.6.3
cc_compile_by          : ianc
cc_compile_domain      : uk.xensource.com
cc_compile_date        : Fri Apr 25 13:38:05 BST 2014
xend_config_format     : 4



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