[Xen-devel] Query regarding Xen - Assigning more than 1 VCPUs to Dom0

[Mohit Dhingra <mohitdhingras@xxxxxxxxx>]

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?

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

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