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

[Brian Krusic <brian@xxxxxxxxxx>]

On Oct 22, 2009, at 12:13 PM, Tait Clarridge wrote:

> 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
Hi,

Heres my grub.conf;

kernel /boot/xen.gz-3.4.1 dom0_max_vcpus=1 dom0_mem=1024M

xend-config.sxp;

(dom0-cpus 1)

Heres my xm vcpu-list after a reboot of the system;

Name            ID      VCPU    CPU     State   Time(s)         CPU Affinity
Domain-0        0       0               0               r--             216.6   
        any cpu


Heres my xm vcpu-list after xm vcpu-pin;

Name            ID      VCPU    CPU     State   Time(s)         CPU Affinity
Domain-0        0       0               0               r--             12585.6 
        0

I tired to format this nice for you so please excuse if it come out  
like crap.
Notice the the CPU Affinity column.

Any ideas?

- Brian

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