[Bug 1314189] [NEW] instance creation fails on compute nodes with > 175 instances

[James Page]

Public bug reported:

Setup: Neutron ML2 plugin, OpenvSwitch mechanism driver, Neutron
Security Groups enabled.

When compute nodes get busy with lots of instances (> 175), the neutron-
openvswitch-agents start to take a long time to parse and update
iptables firewall rules; we see the agent state go inactive and after a
while nova gives up waiting for the notification from neutron to say
that everything is setup and just tears down the instance (which was in
paused state awaiting port creation I think).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: neutron-plugin-openvswitch-agent 1:2014.1-0ubuntu1
ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Tue Apr 29 12:49:49 2014
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: neutron
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.neutron.rootwrap.d.openvswitch.plugin.filters: [deleted]

** Affects: neutron
     Importance: Undecided
         Status: New

** Affects: neutron (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty uec-images

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1314189

Title:
  instance creation fails on compute nodes with > 175 instances

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