Re: [PATCH] nodeinfo: Add workaround if kernel reports bogous numa topology.

[George-Cristian Bîrzan <gc@xxxxxxxxxx>]

On Wed, Oct 31, 2012 at 4:50 PM, George-Cristian Bîrzan <gc@xxxxxxxxxx> wrote:

on 0.10.2:

[root@host34 libvirt]# virsh nodeinfo

CPU model:           x86_64

CPU(s):              24

CPU frequency:       2200 MHz

CPU socket(s):       1

Core(s) per socket:  6

Thread(s) per core:  1

NUMA cell(s):        4

Memory size:         131971020 KiB

and http://birzan.org/capabilities4-newlibvirt.txt 

This has made the problem even worse, as we now can only use 6 cores out of 24 by default (libvirt pins qemus to the CPUs is sees available, so we have to manually taskset them after starting).

I should check before I let my mouth run. This actually fixed the problem, we now get all 24 CPUs:

virsh # vcpuinfo 08867271-d458-43dc-8a03-807e83d107b4

VCPU:           0

CPU:            9

State:          running

CPU time:       1.3s

CPU Affinity:   yyyyyyyyyyyyyyyyyyyyyyyy

To give you an example from the 'broken' host (still with 0.10.2):

[root@host29 ~]# virsh vcpuinfo 17db9ebb-691b-47e1-bbf4-c9e3c1388d4f

VCPU:           0

CPU:            3

State:          running

CPU time:       3103.2s

CPU Affinity:   yyyyyyyyyyyy

VCPU:           1

CPU:            1

State:          running

CPU time:       3460.4s

CPU Affinity:   yyyyyyyyyyyy

 

-- 
George-Cristian Bîrzan
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