关键词: 软件定义网络, 数据中心网络, 时限感知, 拥塞控制, TCP Incast

Abstract: With the development of Software Defined Networking（SDN） data center, the problem about high latency of short flows is brought by competitions of long flows and short flows as well as TCP Incast. This paper proposes the SDN-D2TCP scheme to solve this problem. The scheme uses the advantages of SDN centralized control and detects many-to-one communication by controller, then predicts bottlenecks of switches caused by TCP Incast. Considering the requirements of latency-sensitive flows, the scheme combines the deadline-aware of D2TCP and the explicit congestion notification mechanism to modulate the congestion windows and improve the competitive power of short flows. The NS2 simulation experiments indicate that, compared with DCTCP and D2TCP, SDN-D2TCP can reduce the occurrence of TCP Incast effectively and ensure low latency for short flows.

Key words: software defined networking, data center network, deadline-aware, congestion control, TCP Incast