libvirt users - Jan 2014 - Re: Does libvirt lxc driver support "cpuset" attribute?

Dear all

I allocate only one vcpu for the container by the following statement, that is,
I want to pin the vcpu to physical core "2".
<vcpu placement='static' cpuset="2" >1</vcpu>
My host has 4 physical cores. Before test, all the 4 cores are idle. After I run
4 processes in the container, I found all the 4 cores in the host are 100% used.
That is, the container is pinned to all the available physical CPUs. This is not
what I want.
My libvirt version is 1.0.3.
Although "vcpupin" element also can be used to pin vcpu, according to
http://libvirt.org/formatdomain.html , "vcpupin" element is not
supported by lxc driver.

I wonder if it is the older version of libvirt that causes the problem?

Thank you in advance.
Cheng Wang

On Wed, Jan 15, 2014 at 05:49:23AM +0000, WANG Cheng D
wrote:
> Dear all
> 
> I allocate only one vcpu for the container by the following
> statement, that is, I want to pin the vcpu to physical core "2".
> <vcpu placement='static' cpuset="2" >1</vcpu>
> My host has 4 physical cores. Before test, all the 4 cores are
> idle. After I run 4 processes in the container, I found all the
> 4 cores in the host are 100% used. That is, the container is
> pinned to all the available physical CPUs. This is not what I
> want.
> My libvirt version is 1.0.3.
Support for cpuset with LXC was added in 1.0.4 I'm afraid.

Daniel
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Dear Daniel,
Thank you for the information. :-)

Cheng

On Wed, Jan 15, 2014 at 05:49:23AM +0000, WANG Cheng D
wrote:
> Dear all
> 
> I allocate only one vcpu for the container by the following statement, 
> that is, I want to pin the vcpu to physical core "2".
> <vcpu placement='static' cpuset="2" >1</vcpu>
My host has 4 physical
> cores. Before test, all the 4 cores are idle. After I run 4 processes 
> in the container, I found all the
> 4 cores in the host are 100% used. That is, the container is pinned to 
> all the available physical CPUs. This is not what I want.
> My libvirt version is 1.0.3.
Support for cpuset with LXC was added in 1.0.4 I'm afraid.

Daniel
--