[Xen-users] VCPU and CPU Manipulation

["Omer Khalid" <Omer.Khalid@xxxxxxx>]

Hi,

I have a dual core SMP machine ( in total 4 cores). I have been trying to set restrict vcpu/cpus for my domU to one core/one vpcu but it have not fully worked. As there are two commands "xm vcpu-set" and "xm vcpu-pin". By using these commands, i have observed that the sequence in which they are used plays a role. e.g. I have the following state in the beginning:

[root@lxb ~]# xm vcpu-list
Name         ID     VCPUs CPU   State Time(s)      CPU Affinity

====         ==     ===== ====  ==== ======     === =====
Domain-0    0       0          3        r--      5593.4        any cpu
Domain-0    0       1          1        -b-     15361.9      any cpu
Domain-0    0       2          0        -b-     10137.5      any cpu
Domain-0    0       3          -         --p     78.9           any cpu
test_lxb      20     0          2         -b-     21169.0     any cpu

What I want to achieve is that my domU (test_lxb) uses one VCPU pinned to one CPU. In the above state, both my domU and dom0 are using VCPU 0 (which is pinned to use either CPU 3 or 2.) After few "vcpu-set" and "vcpu-pin", I reach the following stage where dom0 is pinned to CPU 3 and domU (test_lxb) is pinned to CPU 2:

[root@lxb ~]# xm vcpu-list
Name ID VCPUs CPU State Time(s) CPU Affinity

Name         ID     VCPUs CPU   State Time(s)      CPU Affinity

====         ==     ===== ====  ==== ======     ========

Domain-0    0       0         3        r--      5600.4            3
Domain-0    0       1         3        -b-     15372.5           3
Domain-0    0       2         3        -b-     10140.0           3
Domain-0    0       3         -         --p     78.9                3
test_lxb      20     0         2         -b-     21169.5           2 

But domU is still using VCPU 0 which is also used by my domU; now i would like to restrict VCPU 0 to CPU 2 only for domU only...I am wondering how to achieve this last mile?

Any ideas? Thanks for you help in advance!

Regards
--
Omer

-------------------------------------------------------
CERN -- European Organization for Nuclear
Research, IT Department, CH-1211,
Geneva 23, Switzerland

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