摘要：Software-defined Networking (SDN) is commonly seen as a promising way towards future Internet. Understanding the performance and limitation of its logically centralized controllers is a prerequisite of SDN deployments. For this end, this paper proposes a concise queuing model for SDN controller performance. We first investigate that the input of a SDN controller is a hybrid Poisson stream of packet-in messages. Then, we analyze the message processing of a SDN controller to achieve a concise queuing model M/M/1 for its performance, and further derive its performance parameters from queuing theory. Finally, our proposed model is evaluated by measuring a well-known controller with the benchmark Cbench. Experimental results indicate that our model is a better approximation of the controller performance than the existing ones.
其他关键词：software-defined networking, SDN controllers, performance evaluation, queuing model.
