After covering the OVS bridge interfaces in brief we showed how Neutron communicates with Open vSwitch. With OVS being the most used virtual switch in OpenStack Datacenter deployment this is important in understanding the relationship between OVS and OpenStack.
We described how Open vSwitch and Neutron are evolving to address higher performance, scaling requirements. We touched upon the scaling and performance enhancements provided by DVR, and how OVN seeks to simplify OVS Neutron integration by bringing in native supports of SDN constructs such as logical switches, routers, and ACLs. We also talked about how Dragonflow seeks to improve on the scaling and performance in certain deployment scenarios. Finally, we touched upon DPDK which significantly enhances the packet throughput by reducing the overhead of executing processing in Kernel.