On 01/26/2015 05:37 PM, Jay Pipes wrote:
On 01/26/2015 07:33 AM, Chris Friesen wrote:
Hi,
I'm interested in the recent work around NUMA support for guest
instances
(https://blueprints.launchpad.net/nova/+spec/virt-driver-numa-placement), but
I'm having some difficulty figuring out what versions of libvirt and
qemu are required.
From the research that I've done it seems like qemu 2.1 might be
required, but I've been unable to find a specific version listed in the
nova requirements or in the openstack global requirements. Is it there
and I just can't find it?
If it's not specified, and yet openstack relies on it, perhaps it should
be added. (Or at least documented somewhere.)
Hi Chris,
The constants starting here:
http://git.openstack.org/cgit/openstack/nova/tree/nova/virt/libvirt/driver.py#n340
should answer your questions.
Thanks, that's useful.
Looking at the history of that file, I see git commit d927635 adding in support
for NUMA memory allocation policy using the libvirt numatune option, but it
doesn't modify the libvirt or qemu version requirements.
When I asked on the libvirt list they said that qemu 2.1 was needed to support
pinning memory on host NUMA nodes. Do we get around that somehow?
Also, the _get_host_numa_topology() code uses pages.size and pages.total which
would seem to depend on hugepages support in libvirt, but that was only added in
1.2.6. I don't see any hugepage-related versions listed here for libvirt. (I
actually ran into a problem here before upgrading libvirt, it threw an exception
in _get_host_numa_topology(). If I recall it was because cell.mempages was
empty since libvirt was too old.)
Chris
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