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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

The problem isn't nova. It's taking a long time to setup networking on
the neutron side after the VIF is plugged for the guest on the compute
host. Nova starts waiting for an event callback from neutron here:

46259:2017-10-03 20:07:07.322 7 DEBUG nova.compute.manager [req-
de0f02c8-9410-424f-bdac-60926f4533b0 94c7b04e8c0a4d249759e41bd3d112b2
8a228c4fdc87485e93dea603a4d4fb4e - - -] [instance:
4eb3c163-3e86-4686-9783-c582938a9a36] Preparing to wait for external
event network-vif-plugged-ed68732a-eede-4b85-a756-7a360d47a1cd
prepare_for_instance_event /usr/lib/python2.7/site-
packages/nova/compute/manager.py:328

And gets it here:

46337:2017-10-03 20:07:13.272 7 DEBUG nova.compute.manager [req-
37bc640d-ea75-442b-8d70-4f4c1db7190e b79d2473bdd84ce0b9686d7fa7c9aa87
9b7d49eb017549609814c6ee33deda48 - - -] [instance:
4eb3c163-3e86-4686-9783-c582938a9a36] Processing event network-vif-
plugged-ed68732a-eede-4b85-a756-7a360d47a1cd _process_instance_event
/usr/lib/python2.7/site-packages/nova/compute/manager.py:6788

That took nearly 6 minutes, so there are some obvious performance issues
with your neutron backend. The default vif plugging timeout is 5
minutes, so you must have already adjusted the vif_plugging_timeout
config option in nova.conf.

** Changed in: nova
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1721025

Title:
  it took 751s when spawning an instance which was booted from image

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Hi Guys,

  I found it was very slow when creating an instance which was booted from image. 
  In the nova-compute.log, it reported "Took 751.23 seconds to spawn the instance on the hypervisor".

  [root@cloud-2 ~]# rpm -qa |grep nova
  python2-novaclient-7.1.1-1.el7.noarch
  python-nova-15.0.4-1.el7.noarch

  centos7,libvirt+kvm

  Neutron with OpenVSwitch

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