[ovs-discuss] Incremental perf results

[Mark Michelson]

Hi Han,

(cc'ed ovs-discuss)

I have some test results here for your incremental branch[0].

Browbeat was the test orchestrator for the test, and it uses 
ovn-scale-test[1] to configure the test parameters and run the test.

The test use one central node on which ovn-northd runs. There are three 
farm nodes on which sandboxes are run for ovn-controller. Each farm node 
runs 24 sandboxes, for a total of 72 sandboxes (and thus 72 
ovn-controller processes).

The test uses the datapath context[2] to set up 72 logical switches and 
one logical router in advance. Then during each test iteration, a 
logical switch port is added to one of the logical switches and bound on 
one of the sandboxes. The next iteration does not start until the 
previous iteration is 100% complete (i.e. we see that the logical switch 
port is "up" in the northbound db). The total number of logical switch 
ports added during the tests is 3312.

During the test, I ran `perf record` on one of the ovn-controller 
processes and then created a flame graph[3] from the results. I have 
attached the flame graph to this e-mail. I think this can give us a good 
jumping off point for determining more optimizations to make to 
ovn-controller.

[0] https://github.com/hzhou8/ovs/tree/ip7
[1] https://github.com/openvswitch/ovn-scale-test
[2] https://github.com/openvswitch/ovn-scale-test/pull/165
[3] http://www.brendangregg.com/FlameGraphs/cpuflamegraphs
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