RE: [Xen-users] How-To pin Dom0 to CPU

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ryan Burke
> Sent: 18 April 2007 20:28
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] How-To pin Dom0 to CPU
> 
> I've looked online and searched through alot of the archives 
> but I haven't
> found a good explanation with the associated commands to pin 
> Dom0 (or a
> DomU) to a certain cpu. I would like Dom0 to be pinned to CPU0 core0
> (2xdual-core opterons) and then let all the other DomU's only 
> have 1 CPU
> but they can use any of the other 3 cores left open. Dom0 
> will have its
> own core.
> 
> Can someone give me some examples on how I would do that?

You can do this by setting (com0-cpus n), where n is the number of CPU's
you want to use. It picks from the low to high numbers, so you if you
set it to 1, it will pick CPU0, if you set it to 3, it will pick CPU0,
CPU1, CPU2, and so on. This is done in /etc/xen/xend-config.sxp. 

You'll then have to set CPUS=... in config file for the guest, e.g.
cpus="1-3" or cpus="1". You can also use regular expression inversion:
cpus="^0-1", which means "any but 0 and 1". 


> 
> I appreciate the help with this problem.
> 
> Ryan
> 
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