Re: [Xen-users] xen cpu affinity, ie; pinning cpus

[Brian Krusic <brian@xxxxxxxxxx>]

Hi Robert,

I did the grub mods.

Here what I have now;

Name                                ID  VCPU   CPU State   Time(s) CPU Affinity

Domain-0                             0     0     0   r--     216.6 any cpu

fm                                         0                   0.0 1

intranet                                   0                   0.0 2

michel                               3     0     3   -b-      10.1 3

michel                               3     1     4   -b-       6.6 4

vault                                1     0     5   -b-      23.2 5

zello                                2     0     6   -b-      21.0 6

zello                                2     1     7   -b-      20.1 7

Why does Domain-0 say any cpu under CPU Affinity?

I still notice it changes from 0 to 4 to 0 to 3 to ...

Functions much better overall.

Just curious how to properly interpret the behavior.

- Brian

On Oct 21, 2009, at 12:03 PM, Robert Dunkley wrote:

Hi Brian,

 

You need to set this in your kernel config as well as xend-config.sxp, eg. add the following to your kernel line in grub.conf:

dom0_max_vcpus=2

 

Set d cpu affinity, ie; pinning cpus

Hi all,

I've read a few posts about this and have pinned my domUs.

I've a dual quad core Opteron.

I've also set dom0-cpus 1 in my xend-config file.

xm vcpu-list shows

Name                                ID  VCPU   CPU State   Time(s) CPU 
Affinity
Domain-0                             0     0     0   r--   59582.6 any 
cpu
Domain-0                             0     1     -   --p   13227.9 any 
cpu
Domain-0                             0     2     -   --p   13527.5 any 
cpu
Domain-0                             0     3     -   --p   12448.3 any 
cpu
Domain-0                             0     4     -   --p   13520.6 any 
cpu
Domain-0                             0     5     -   --p   17223.0 any 
cpu
Domain-0                             0     6     -   --p   12614.1 any 
cpu
Domain-0                             0     7     -   --p   13570.9 any 
cpu
bugs                                24     0     2   -b-     598.5 2
logantools                          26     0     3   -b-     147.8 3
nello                               27     0     5   -b-     246.7 5
zmail                               25     0     6   -b-    8064.4 6
zmail                               25     1     7   r--    7681.2 7

Every few seconds, the first occurrence of Domain-0 changes to 4, then 
back to 0.

Why?

If I change dom0-cpus 2 so that it uses 2 cpus, xend won't restart and 
errors;

[2009-10-21 10:36:54 26309] INFO (XendDomainInfo:157) Recreating 
domain 0, UUID 00000000-0000-0000-0000-000000000000. at /local/domain/0
[2009-10-21 10:36:54 26309] DEBUG (XendDomain:452) Adding Domain: 0
[2009-10-21 10:36:54 26309] DEBUG (XendDomain:386) number of vcpus to 
use is 2
[2009-10-21 10:36:54 26309] ERROR (SrvDaemon:349) Exception starting 
xend (Cannot set vcpus greater than max vcpus on running domain)
Traceback (most recent call last):

So it appears I don't understand cpu pinning when it comes to dom0.

- Brian


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