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[QA][nova][Concurrent performance]

Hello everyone! 

Why the performance of Stein concurrent creation of VM is not as good as that of Ocata?
Create 250 VMs concurrently, the O version only needs 160s, but the S version needs 250s.
Security_group and port_security functions are disabled.
Among 250 VMs, there are single network card and multi-network card.
Using neutron-openvswitch-agent.


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