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Message #26126
[Bug 1386236] Re: NUMA scheduling will not attempt to pack an instance onto a host
** Changed in: nova
Status: Fix Committed => Fix Released
** Changed in: nova
Milestone: None => kilo-1
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1386236
Title:
NUMA scheduling will not attempt to pack an instance onto a host
Status in OpenStack Compute (Nova):
Fix Released
Status in OpenStack Compute (nova) juno series:
Fix Released
Bug description:
When creating a flavor which includes "hw:numa_nodes": "1", all
instances booted with this flavor are always pinned to NUMA node0.
Multiple instances end up on node0 and no instances are on node1. Our
expectation was that instances would be balanced across NUMA nodes.
To recreate:
1) Ensure you have a compute node with at least 2 sockets
2) Create a flavor with vcpus and memory which fits within one socket
3) Add the flavor key: nova flavor-key <flavor> set hw:numa_nodes=1
4) Boot more than 1 instances
5) Verify where the vcpus are pinned
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References