Hi,
The full details are available at https://bugs.launchpad.net/nova/+bug/1590091
but the short version is this:
1) I'm running stable/mitaka in devstack. I've got a small system with 2 pCPUs,
both marked as available for pinning. They're two cores of a single processor,
no threads.
2) I tried to boot an instance with two dedicated CPUs and a thread policy of
ISOLATE, but the NUMATopology filter fails my host.
In _pack_instance_onto_cores(), in _get_pinning() we have the following line:
if threads_no * len(sibling_set) < len(instance_cores):
return
Coming into this line of code the variables look like this:
(Pdb) threads_no
1
(Pdb) sibling_set
[CoercedSet([0, 1])]
(Pdb) len(sibling_set)
1
(Pdb) instance_cores
CoercedSet([0, 1])
(Pdb) len(instance_cores)
2
So the test evaluates to True, and we bail out.
I don't think this is correct, we should be able to schedule on this host since
it has two full physical cores available.
Chris
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