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

[Tait Clarridge <tait@xxxxxxxxxxxx>]

On Thu, 2009-10-22 at 10:25 -0700, Brian Krusic wrote:
> Hi,
> 
> 
> Yes, i read several article about having dom0 pinned to 1 cpu.
> 
> 
> Funny thing is that I do this via xend-config-sxp and grub-conf but xm
> vcpu-list still shows dom0 as "any" under affinity column.
> 
> 
> When I run xm vcpu-pin Domain-0 0 0, xm vcpu-list then shows "0" under
> the affinity column until I reboot.
> 
> 
> Any ideas?
> 

After setting (dom0-cpus 1) in /etc/xen/xend-config.sxp did you restart
the xend service?

If I remember correctly, it should be safe to do when domU's are
running.

This should pin Domain-0 to cpu0.

eg.

[root@xxxxxx ]# xm vcpu-list
Name                              ID VCPUs   CPU State   Time(s) CPU
Affinity
Domain-0                           0     0     0   r--  1648038.3 0
Domain-0                           0     1     -   --p       3.1 1
Domain-0                           0     2     -   --p       3.9 2
Domain-0                           0     3     -   --p       3.8 3
Domain-0                           0     4     -   --p       3.7 4
Domain-0                           0     5     -   --p       3.1 5
Domain-0                           0     6     -   --p       3.2 6
Domain-0                           0     7     -   --p       3.6 7
xendomainhere                      1     0     4   -b-  300000.1 any cpu

That shows that my vm host has 8 cores, but is only using one for
Domain-0.. the rest are in a paused state, so now what I can do is pin
them from the config files to use a core from cpus 1-7 or pin the domU
to a specific one as well.

Tait

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