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[OpenStack Infra <1774217@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/571579
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=50b3a168e86316ab92ba828c1a00ab963532ad1c
Submitter: Zuul
Branch:    master

commit 50b3a168e86316ab92ba828c1a00ab963532ad1c
Author: Matt Riedemann <mriedem.os@xxxxxxxxx>
Date:   Thu May 31 17:41:27 2018 -0400

    Mention neutron-rootwrap-daemon in root_helper_daemon option help
    
    An operators mailing list thread [1] discussing scale issues
    where vif plugging times out eventually came to the conclusion
    that several operators run rootwrap in the neutron agent in daemon
    mode.
    
    This ability is not clear from the configuration option help, however,
    so this change adds more details on running in this mode to achieve
    scale. Another nice discussion about this can be found here [2].
    
    There is a corresponding nova patch [3] to mention this option
    if operators are hitting vif plugging timeouts in nova.
    
    This doesn't change any defaults, it just improves the documentation.
    
    The help text formatting is also updated for easier readability
    and maintainability in the source.
    
    [1] http://lists.openstack.org/pipermail/openstack-operators/2018-May/015364.html
    [2] https://cloudblog.switch.ch/2017/08/28/starting-1000-instances-on-switchengines/
    [3] https://review.openstack.org/571577/
    
    Change-Id: I8b8a0cfea409c3469ad0ee223c87e0380b3afbad
    Closes-Bug: #1774217


** Changed in: neutron
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1774217

Title:
  docs: vif_plugging_timeout nova config option should mention running
  neutron rootwrap in daemon mode for performance

Status in neutron:
  Fix Released
Status in OpenStack Compute (nova):
  In Progress

Bug description:
  There are notes from this operators mailing list thread about how the
  neutron agent needed to be configured for rootwrap daemon mode to hit
  scale targets otherwise servers would fail to create due to vif
  plugging timeouts:

  http://lists.openstack.org/pipermail/openstack-
  operators/2018-May/015364.html

  This bug is used to track the documentation updates needed in both
  nova and neutron.

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