Re: [libvirt-users] questions around using numatune/numa/schedinfo
On 23.01.2015 19:46, Chris Friesen wrote:
Hi,
I'm running into some problems with libvirt and hoping someone can point
me at some instructions or maybe even help me out.
First, are there any requirements on qemu version in order to use the
"numatune" and/or "cpu/numa/cell" elements? Or do they use cgroups
and
not the native qemu numa support?
For numatune you need a qemu with 'memory-backend-{ram,file}' objects.
Those were introduced in qemu-2.1.0. As of libvirt, you'll need
libvirt-1.2.7 at least. Although the newer the better - there were
couple of fixes recently.
Second, are there any instructions on how to set up cgroups? I
initially hadn't had cgroups mounted and running "virsh schedinfo
<domain>" gave an error. So I mounted "/sys/fs/cgroup/memory" and
"/sys/fs/cgroup/cpu" and restarted libvirtd but running "virsh schedinfo
<domain>" still gives an error:
root@compute-1:~# virsh schedinfo 8
Scheduler : Unknown
error: Requested operation is not valid: cgroup CPU controller is not
mounted
What am I missing?
What's the libvirt version?
Michal