[Xen-users] pinning CPU affinity

[Micah Anderson <micah@xxxxxxxxxx>]

I'm trying to figure out how I can pin the CPU affinity for individual
domU's in their configuration file.

I allocated 3 CPUs to a particular domU, and the CPU affinity is
floating between those three. I want to pin them to specific cores in
the config file. I can do it on bootup by doing vcpu-pin on the
command-line, but I want this to be set int he config file itself.

Right now I have:

vcpus=3
cpus=[0,1,2]

Which I understand gives the domain 3 VCPUs, pins the first VCPU to the
first physical CPU, pins the second to the second physical CPU and the
third to the third CPU. The output of vcpu-list shows that the VCPUs do
seem to be pinned to the physical CPUs as indicated, but the affinity
column is set to 0-2 for each of them, when I want it set specifically
to a single CPU:

root@finch:/etc/xen# xm vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0     3   -b-    2465.5 3
Domain-0                             0     1     1   -b-     218.2 3
Domain-0                             0     2     0   -b-     191.0 3
Domain-0                             0     3     3   r--     445.0 3
canary                               1     0     2   r--   11463.5 0-2
canary                               1     1     1   r--   10293.0 0-2
canary                               1     2     0   r--    9983.4 0-2

I can't seem to figure out how to do this in the configuration file.  I
can issue the commands to get it to happen:

# xm vcpu-pin 1 0 2
# xm vcpu-pin 1 1 1
# xm vcpu-pin 1 2 0
# xm vcpu-list
Name                                ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0                             0     0     0   -b-    2701.5 3
Domain-0                             0     1     3   -b-     237.3 3
Domain-0                             0     2     3   -b-     217.2 3
Domain-0                             0     3     3   r--     497.9 3
canary                               1     0     2   r--   12547.4 2
canary                               1     1     1   ---   11156.5 1
canary                               1     2     0   -b-   10757.2 0

thanks for any help,
micah

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