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

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

> -----Original Message-----
> From: Ryan Burke [mailto:burke@xxxxxxxxxxxxxxxxx] 
> Sent: 21 April 2007 16:07
> To: Petersson, Mats
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] How-To pin Dom0 to CPU
> 
> >
> >
> >> -----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
> 
> How can you tell if a DomU is bound to a certain CPU? I added 
> cpus="^0" in
> its config and restarted the DomU but I only see it listed as 
> VCPU 0, I
> don't see where it states that this DomU's VCPU is attached 
> to CPU 1 (only
> a 2 processor single core system).

"xm vcpu-list" will list which vcpu is running on which pcpu, as well as
listing the affinity (which PCPU's are "allowed"). 

--
Mats
> 
> Thanks,
> Ryan
> 
> 
> 



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