RE: [Xen-users] Configuring CPUs on domU

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

> -----Original Message-----
> From: sachin goel [mailto:sachin.goel@xxxxxxxxxx] 
> Sent: 11 May 2007 12:15
> To: Petersson, Mats
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-users] Configuring CPUs on domU
> 
> Hi Mats,
>             I guess that means we can specify the number of 
> virtual CPUs 
> we want on our guest VM (through the 'vcpus' field in the 
> config file) 
> and also the physical CPUs (through the 'cpus' field) we want 
> to use for 
> our guest VM. But we can not specify any type of binding of a virtual 
> CPU with one or more physical CPUs in the config file.

Yes, that's correct, you could specify that you want two VCPUs and the
four physical CPU's (which by the way may well be a better option
anyways, as it allows the scheduler to find "any free" physical CPU -
for example, if CPU2 and 3 are free to run, and CPU0 and 1 are busy, you
can still run both VCPU's on 2&3. 

--
Mats
>             Please correct me if I am wrong !!
> 
> Thanks,
> Sachin.
> 
> Petersson, Mats wrote:
> 
> > 
> >
> >  
> >
> >>-----Original Message-----
> >>From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> >>[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> >>sachin goel
> >>Sent: 11 May 2007 10:31
> >>To: xen-users@xxxxxxxxxxxxxxxxxxx
> >>Subject: [Xen-users] Configuring CPUs on domU
> >>
> >>Hi,
> >>    I have a server with four CPUs.  I need to create a domU 
> >>on it with 
> >>two virtual CPUs. I want to map the virtual CPUs like this :
> >>First VCPU -- first and second Physical CPU
> >>Second VCPU -- third and fourth Physical CPU.
> >>    
> >>
> >
> >You can do that manually after you've started the Domain, 
> but you can't
> >do it in the configuration script for the domain. Use "xm vcpu-pin
> ><domain> <vcpu> <pcpu(s)>", so for example:
> >
> ># xm vcpu-pin vm1 0 0-1
> ># xm vcpu-pin vm1 1 2-3
> >
> >This will do what you describe above.
> >
> >--
> >Mats
> >  
> >
> >>     I need to know if that can be done for a xen domU and if 
> >>yes, how 
> >>shud I specify that setting in the config file of the domU.
> >>    Any help will be much appreciated.
> >>
> >>Thanks,
> >>Sachin.
> >>
> >>   
> >>
> >>_______________________________________________
> >>Xen-users mailing list
> >>Xen-users@xxxxxxxxxxxxxxxxxxx
> >>http://lists.xensource.com/xen-users
> >>
> >>
> >>
> >>    
> >>
> >
> >
> >
> >_______________________________________________
> >Xen-users mailing list
> >Xen-users@xxxxxxxxxxxxxxxxxxx
> >http://lists.xensource.com/xen-users
> >
> >  
> >
> 
> 
> 
> 



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