Re: [Xen-users] understanding xens use of smp

[Brock Palen <brockp@xxxxxxxxx>]

Quoting Tom Brown <tbrown@xxxxxxxxxxxxx>:

> On Sat, 1 Oct 2005, Ted Kaczmarek wrote:
>
> > On Sat, 2005-10-01 at 12:58 -0400, Brock Palen wrote:
> > > Im trying to find some clarification of xen-2.0.7 use of smp machines,
> > > the output from 'xm dmesg'  shows cpus0 and cpu1, and the FAQ says 
> > why dom0
> > > doesnt show the second cpu, how do i know that my single domU is 
> > bound to cpu1
> > > ?
> >
> > 2.0.7 does not support SMP domU's.
> That wasn't his question.
>
> xm list will show which domains are running on which CPUs. Unfortunately,
> if you have hyperthreading enabled, you need to know which cpus map to
> which threads on which cores... otherwise you can easily have two doms
> running on opposite threads on the same core, and the other core being
> idle :(  [in fact that is the default]
>
> I don't have the official CPU numbering in my head, but I believe a dual
> CPU system with hyperthreading enabled will have cpu's 0 and 1 on the two
> threads of the first core, and 2 and 3 on the threads of the second
> core... so if you only have dom0 and one domU running, you would want to
I have from xm list
Name              Id  Mem(MB)  CPU  State  Time(s)  Console
Domain-0           0      123    0  r----   7543.7
mls                1      499    1  -b---   4764.2    9601

Its a duel P3 so no hyperthreading, and xm info shoes only 1 hypterthread per
cpu, and 2 cores,  so domain mls (domU) is using the second cpu, thats great
thankyou!


>  xm pincpu domUname 2
>
> or put cpu=2 into the config file for the domU
>
> -Tom
>
>
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