Re: [Xen-users] pincpu in 3.0

[Ryan Harper <ryanh@xxxxxxxxxx>]

pincpu for multiple vcpu domains is present.  

root@bebop:~ # xm help pincpu
pincpu DOM VCPU CPUS

Set which cpus VCPU in domain DOM can use.


You can only specify one VCPU at a time, but the CPUS value can either
be a single CPU, or it can be a range: 

xm pincpu 4 2 0-2,7,9-12

The CPU range is converted into a bitmap which indicates which physical
cpus a VCPU can run upon.  The current implementation only picks the
first CPU in the list and pins the VCPU there.  Some more examples below:

root@bebop:~ # xm list -v 4
Name              Id  VCPU  CPU  CPUMAP
debian_sarge_3     4     0    1  0xf
debian_sarge_3     4     1    0  0xf
debian_sarge_3     4     2    1  0xf
debian_sarge_3     4     3    0  0xf
root@bebop:~ # xm pincpu 4 2 0
root@bebop:~ # xm list 4
Name              Id  Mem(MB)  CPU VCPU(s)  State  Time(s)  Console
debian_sarge_3     4      128    1      4   -b---      9.8     9604
root@bebop:~ # xm list -v 4
Name              Id  VCPU  CPU  CPUMAP
debian_sarge_3     4     0    1  0xf
debian_sarge_3     4     1    0  0xf
debian_sarge_3     4     2    0  0x1
debian_sarge_3     4     3    0  0xf

-- 
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253   T/L: 678-9253
ryanh@xxxxxxxxxx

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