[Bug 1878376] Re: instances with hugepages intermittently fail to start

[James Page]

This may be related to bug 1734204 but right now I can't actually
reproduce that bug on a Queens deployment

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https://bugs.launchpad.net/bugs/1878376

Title:
  instances with hugepages intermittently fail to start

Status in nova package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 18.04 LTS + OpenStack Queens

  Example flavour:

  +----------------------------+--------------------------------------+
  | Field                      | Value                                |
  +----------------------------+--------------------------------------+
  | OS-FLV-DISABLED:disabled   | False                                |
  | OS-FLV-EXT-DATA:ephemeral  | 0                                    |
  | access_project_ids         | None                                 |
  | disk                       | 0                                    |
  | id                         | 9f3946cc-df0c-468a-80a9-808702d9a620 |
  | name                       | 4c-8192m                             |
  | os-flavor-access:is_public | True                                 |
  | properties                 | hw:mem_page_size='large'             |
  | ram                        | 8192                                 |
  | rxtx_factor                | 1.0                                  |
  | swap                       |                                      |
  | vcpus                      | 4                                    |
  +----------------------------+--------------------------------------+

  *some* instance creation requests fail to start instances due to lack
  of available hugepages on the numa node being targeted for the
  instance (log data to follow).  Workaround to alleviate this symptom
  has been to split the flavor across to numa nodes using
  hw:numa_nodes=2 as an additional property, which means the cores for
  the instance can be split across the numa nodes on the hypervisor.
  This does have a performance overhead.

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