Re: Query regarding Xen - Assigning more than 1 VCPUs to Dom0

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Thu, Mar 08, 2012 at 07:16:25PM +0530, Mohit Dhingra wrote:
> *Hi Xen-users,*
> 
> I have a doubt regarding assigning VCPUs to Dom0 and DomUs, Please give me
> some pointers to sort them out.
> 
> 1. I have assigned one VCPU to Dom0 ( by (dom0-cpus 1) in xend-config.sxp
> ), it works fine.
> cadlab:/srv/cloud/one # xm list
> Name                                        ID   Mem VCPUs      State
> Time(s)
> Domain-0                                     0  3964     1     r-----
> 203993.1
> one-5                                        2  1024     1     -b----
> 10241.9
> one-6                                        4  1024     1     -b----
> 3970.8
> one-7                                        1  1024     1     -b----
> 4052.7
> one-8                                        3  1024     1     --p---
> 2246.7
> 
> cadlab:/srv/cloud/one # xm vcpu-list
> Name                                ID  VCPU   CPU State   Time(s) CPU
> Affinity
> Domain-0                             0     0     6   r--  203985.6 6
> Domain-0                             0     1     -   --p       1.7 7
> Domain-0                             0     2     -   --p       1.6 any cpu
> Domain-0                             0     3     -   --p       2.3 any cpu
> Domain-0                             0     4     -   --p       1.3 any cpu
> Domain-0                             0     5     -   --p       1.2 any cpu
> Domain-0                             0     6     -   --p       1.5 any cpu
> Domain-0                             0     7     -   --p       1.7 any cpu
> one-5                                2     0     2   -b-   10241.9 2
> one-6                                4     0     4   -b-    3970.8 4
> one-7                                1     0     5   -b-    4052.7 5
> one-8                                3     0     3   ---    2246.7 3
> 
> 
> But when I assign 2 VCPUs to Dom0, it gives me following error: ( by
> (dom0-cpus 2) in xend-config.sxp )
> cadlab:/srv/cloud/one # xm list
> Error: Unable to connect to xend: Connection refused. Is xend running?

What version of Xen? What version of Linux? Have you tried 'xl' instead?
> 
> I want to pin Dom0 to 2 VCPUs. When I do that by providing (dom0-cpus 0 )
> and pinning 2 of the cores to 2 VCPUs ( by xm vcpu-pin), it doesn't seem to
> use the other core.
> 
> Also, My system is Intel i7 950, which is quad core, but it shows 8 CPUs
> probably because of hyperthreading. How should I disable it?

> 
> *
> ----------------------------
> Thanks & Regards
> Mohit Dhingra
> +919611190435*

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel