[Bug 1729274] Re: sudo/rootwrap calls consuming large amounts of CPU

[James Page]

$ time sudo /usr/bin/python /usr/bin/neutron-rootwrap
/etc/neutron/rootwrap.conf ip6tables-save

real    0m0.590s
user    0m0.496s
sys     0m0.064s


$ time sudo ip6tables-save

real    0m0.050s
user    0m0.004s
sys     0m0.016s

neutron-rootwrap is adding an overhead of 540ms - which when aggregated
appears to be causing issues.

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https://bugs.launchpad.net/bugs/1729274

Title:
  sudo/rootwrap calls consuming large amounts of CPU

Status in neutron package in Ubuntu:
  New

Bug description:
  I've only seen this on zesty deployments (things appear to be OK on
  xenial); the net result of these slow calls is that network setup ops
  for instances take along time to complete; this results in failed
  instance launches (and as a result failed tempest tests).

  I'm going to recheck without proposed so see if I see the same
  problems.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: neutron-openvswitch-agent 2:10.0.3-0ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-37.41-generic 4.10.17
  Uname: Linux 4.10.0-37-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4.5
  Architecture: amd64
  Date: Wed Nov  1 11:23:00 2017
  Ec2AMI: ami-00000302
  Ec2AMIManifest: FIXME
  Ec2AvailabilityZone: nova
  Ec2InstanceType: m1.medium
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  PackageArchitecture: all
  ProcEnviron:
   TERM=screen-256color-bce
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: neutron
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.neutron.plugins.ml2.openvswitch_agent.ini: [modified]
  mtime.conffile..etc.neutron.plugins.ml2.openvswitch_agent.ini: 2017-11-01T10:27:38.248334

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