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[Augustina Ragwitz <1614882@xxxxxxxxxxxxxxxxxx>]

Marking this bug as invalid because it was determined to be a feature
request and would be resolved by current specs under review.

** Changed in: nova
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1614882

Title:
  Put VMs without PCI-passthrough device to non-affinitized NUMA node

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description
  ===========

  Instances without pci passthrough requests can overfill host NUMA
  nodes with dedicated for pci passthrough PCI devices. Instances placed
  on such NUMA nodes despite that there are plenty free resources in
  other host NUMA nodes. Such scheduling can lead to situation that
  further deployment of an instance with pci passthrough request 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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