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[Chen Ya Qin <yqchen@xxxxxxxxxx>]

Public bug reported:

I found the time to finishing the applying iptables rules( in neutron/agent/linux/iptables_manager.py  _apply_synchronized,_modify_rules) takes  nearly  more than half an hour( 36 minutes in my environment)  when the number of active vms in cloud is more than 980.
This will lead that the time of bringing new created port up when booting an instance will take very long, and if the vif_plugging_is_fatal is true, the vif_plugging_timeout is not big enough, booting will fail.  
Although optimization on  _modify_rules in patch https://review.openstack.org/#/c/77549/ did help shorten the cost, but still the time is not short enough (it takes 17 minutes when the number of active vms in cloud is more than 980 in my environment). 
Further optimazation on  _modify_rules need be done to fit the situation of Large-scale deployment.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1352826

Title:
  applying iptables rules takes too long when large scale deployment

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  I found the time to finishing the applying iptables rules( in neutron/agent/linux/iptables_manager.py  _apply_synchronized,_modify_rules) takes  nearly  more than half an hour( 36 minutes in my environment)  when the number of active vms in cloud is more than 980.
  This will lead that the time of bringing new created port up when booting an instance will take very long, and if the vif_plugging_is_fatal is true, the vif_plugging_timeout is not big enough, booting will fail.  
  Although optimization on  _modify_rules in patch https://review.openstack.org/#/c/77549/ did help shorten the cost, but still the time is not short enough (it takes 17 minutes when the number of active vms in cloud is more than 980 in my environment). 
  Further optimazation on  _modify_rules need be done to fit the situation of Large-scale deployment.

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