Dear all,
In my applications, the real-time performance is very important, so I used 4 containers,
with only one application running in each container and a physical CPU core is only
dedicated to one lxc. and I must know which container is hosted by which CPU core. That
is, I need to pin a specific lxc to a specific CPU core.
I can achieve this in a native linux system by the following xml script (to pin a libvirt
lxc to core #3 of a machine). It works fine.
<vcpu placement='static' cpuset='3'>1</vcpu>
Now I want to realize this on openstack platform, I carefully read the instruction on CPU
pinning in nova and found that openstack flavor can only support pinning an lxc(instance)
onto a set of CPU cores. I cannot allocate a specific pCPU to an lxc. After the lxc is
started, "dumpxml" only shows the following statement, I even don't know to
which CPU core the lxc is pinned.
<vcpu placement='static' >1</vcpu>
I tried to edit the libvirt.xml for the lxc which locates at nova/instances/#INSTANCE
ID#/libvirt.xml and manually inserted cpuset='3', but this didn't take effect.
After the lxc is restarted, the libvirt.xml is recovered and the modification was not
there anymore.
I googled the question on Internet, but no solution was found. I hope the libvirt people
can help me on this.
Thank you in advance.
Cheng