Research On Hardware Environment Adapted Dynamic Management System Of Open VSwitch

Open vSwitch as a representative of virtual switch,which provides flexible network for virtual machines,is widely applied in software defined network and cloud computing.Virtual switches as first-hop switch for virtual machine,their performance is important to workloads.The key factors that affect performance of virtual switches is: the overhead of network stack,the overhead of flow table matching,and the overhead of packet copy between kernel space and user space.Recent research has been well done to optimize these factors.However,the performance of virtual switch,is greatly affected by hardware environment,such as NUMA topology,network devices.So how to dynamically manage virtual switch to adapt to hardware environment to achieve better performance,becomes an important research topic.Because mainstream virtual switches cannot dynamically adapt to hardware environment,based on OVSDB management protocol of Open vSwitch,as well as NUMA information and network device speed information,a hardware environment adapted dynamic management system of Open vSwitch(OVS-DM)is proposed,which sets a centralized controller to enable automatically management.When network devices of different speed coexist,the load balance mechanism cannot fully utilize high speed network device.We consider the speed of network device as a factor,as well as characteristic of workload,to design and implement a novel load balance mechanism.Besides,a feedback mechanism is designed and implemented in case that virtual switches encounter errors.According to test results,when netperf is used,under different packet size,OVS-DM can improve system throughput by 18.1%~33.7%.OVS-DM can also improve request per second of web server by 13.2%~19.1% when different concurrency level is set.When different workloads coexist,OVS-DM can improve throughput of specific workload by 41.5% and reduce latency of specific workload by 18.2%.