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[Rafael Folco <rfolco@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Description
===========
Instances are packed into node0, always. NUMA placement criteria is undefined when not using CPU pinning and hw:numa_nodes=1.


Steps to reproduce
==================
Create a flavor w/ hw:numa_nodes=1 (hw:cpu_policy unset)

Spawn multiple instances

Check nodeset in the instance XML


Expected result
===============

Use all NUMA nodes by applying some NUMA placement criteria: Spread,
pack or random


Actual result
=============
Only node 0 is used. All others are unused.


Environment
===========

Ubuntu Xenial 16.10, OpenStack Mitaka release, Libvirt 1.3.1

Note: This issue has been found / tested on Ubuntu KVM on Power (ppc64le
arch), however, it affects all architectures.

** Affects: nova
     Importance: Undecided
     Assignee: Rafael Folco (rafaelfolco)
         Status: In Progress


** Tags: numa

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https://bugs.launchpad.net/bugs/1601994

Title:
  instances always packed to NUMA node 0

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  Description
  ===========
  Instances are packed into node0, always. NUMA placement criteria is undefined when not using CPU pinning and hw:numa_nodes=1.


  Steps to reproduce
  ==================
  Create a flavor w/ hw:numa_nodes=1 (hw:cpu_policy unset)

  Spawn multiple instances

  Check nodeset in the instance XML


  Expected result
  ===============

  Use all NUMA nodes by applying some NUMA placement criteria: Spread,
  pack or random


  Actual result
  =============
  Only node 0 is used. All others are unused.


  Environment
  ===========

  Ubuntu Xenial 16.10, OpenStack Mitaka release, Libvirt 1.3.1

  Note: This issue has been found / tested on Ubuntu KVM on Power
  (ppc64le arch), however, it affects all architectures.

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