Public bug reported:
Description
===========
Instances with no pci passthrough requirement can overfill host NUMA
nodes which have attached PCI devices dedicated for pci passthrough.
Instances placed on such NUMA nodes despite that there are plenty free
resources in other host NUMA nodes. Such scheduling can lead to
situation when further deployment of an instance with pci passthrough
will fail because of unavailable capacity in required NUMA node.
Steps to reproduce
==================
Test host with 2 NUMA nodes and PCI device attached to NUMA node 0.
Create a flavor with hw:cpu_policy=dedicated
Spawn several instances without pci passthrough with overall memory
allocation equal memory capacity for NUMA node 0.
Then deploy instance with sr-iov port. Scheduling fails with following
error:
2016-08-18 11:17:15.470 55110 DEBUG nova.compute.manager [req-c6d96425
-e98b-4a63-8289-e56c40ac46d9 bb8e586fd1264034885fef3aae39e777
b770743f66c44840a999cc8cf60916cd - - -] [instance:
b4470025-2a59-4772-9990-a96b55966214] Build of instance
b4470025-2a59-4772-9990-a96b55966214 was re-scheduled: Insufficient
compute resources: Requested instance NUMA topology together with
requested PCI devices cannot fit the given host NUMA topology.
_do_build_and_run_instance /usr/lib/python2.7/site-
packages/nova/compute/manager.py:1945
Environment
===========
Mitaka release
Nova: 13.0.0
** Affects: nova
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1614882
Title:
NUMA node scheduling problem
Status in OpenStack Compute (nova):
New
Bug description:
Description
===========
Instances with no pci passthrough requirement can overfill host NUMA
nodes which have attached PCI devices dedicated for pci passthrough.
Instances placed on such NUMA nodes despite that there are plenty free
resources in other host NUMA nodes. Such scheduling can lead to
situation when further deployment of an instance with pci passthrough
will fail because of unavailable capacity in required NUMA node.
Steps to reproduce
==================
Test host with 2 NUMA nodes and PCI device attached to NUMA node 0.
Create a flavor with hw:cpu_policy=dedicated
Spawn several instances without pci passthrough with overall memory
allocation equal memory capacity for NUMA node 0.
Then deploy instance with sr-iov port. Scheduling fails with following
error:
2016-08-18 11:17:15.470 55110 DEBUG nova.compute.manager [req-c6d96425
-e98b-4a63-8289-e56c40ac46d9 bb8e586fd1264034885fef3aae39e777
b770743f66c44840a999cc8cf60916cd - - -] [instance:
b4470025-2a59-4772-9990-a96b55966214] Build of instance
b4470025-2a59-4772-9990-a96b55966214 was re-scheduled: Insufficient
compute resources: Requested instance NUMA topology together with
requested PCI devices cannot fit the given host NUMA topology.
_do_build_and_run_instance /usr/lib/python2.7/site-
packages/nova/compute/manager.py:1945
Environment
===========
Mitaka release
Nova: 13.0.0
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