[libvirt-users] questions around using numatune/numa/schedinfo
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? 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? Thanks, Chris
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
On Mon, Jan 26, 2015 at 01:08:50PM +0100, Michal Privoznik wrote:
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.
Recently I did a test here with KVM nested virtualization (I was testing from git, so the commits are noted too): https://kashyapc.fedorapeople.org/virt/openstack/nova-libvirt-numa-testing/N... The libvirt guest XML configs are in that directory too. The above test is based on upstream notes in context of OpenStack Nova, written by Daniel Berrangé: https://review.openstack.org/#/c/131818/6/doc/source/devref/testing/libvirt-... -- /kashyap
On 01/26/2015 06:08 AM, Michal Privoznik wrote:
On 23.01.2015 19:46, Chris Friesen wrote:
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.
Okay, thanks. I saw the recent fixes in the git logs.
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?
Libvirt is 1.2.8. Chris
participants (3)
-
Chris Friesen -
Kashyap Chamarthy -
Michal Privoznik