Joint Optimization of Bandwidth for Provider and Delay for User in Software Defined Data Centers

In large-scale Internet applications running on geographically distributed datacenters, such as video streaming, it is important to efficiently allocate requests among datacenters. To the best of our knowledge, existing approaches, however, either solely focus on minimizing total cost for provider, or guaranteeing QoS for end-users. In this paper, we apply the SDN controller to enable the central control of the entire network, and propose a joint optimization model to consider high bandwidth utilization for provider and low delay for users. We present Nash bargaining solution based method to model both requirements of provider’s high bandwidth utilization and end-users’ low delay. Specifically, we formulate the design of request allocation under those requirements as an optimization problem, which is NP-hard. To solve such hard optimization problem, we develop an efficient algorithm blending the advantages of Logarithmic Smoothing technique and the auxiliary variable method. According to the theoretical analysis, we verify the existence and uniqueness of our solution and the convergence of our algorithm. We conduct a large amount of experiments based on real-world workload traces and demonstrate the efficiency of our algorithm compared to both greedy and locality algorithms.