Tsinghua Science and Technology


data center networks, SDN, TCP, congestion, deadline-aware


Cloud data centers now provide a plethora of rich online applications such as web search, social networking, and cloud computing. A key challenge for such applications, however, is to meet soft real-time constraints. Due to the deadline-agnostic congestion control in Transmission Control Protocol (TCP), many deadline-sensitive flows cannot finish transmission before their deadlines. In this paper, we propose an SDN-based Explicit-Deadline-aware TCP (SED) for cloud Data Center Networks (DCN). SED assigns a base rate for non-deadline flows first and gives spare bandwidth to the deadline flows as much as possible. Subsequently, a Retransmission-enhanced SED (RSED) is introduced to solve the packet-loss timeout problem. Through our experiments, we show that SED can make flows meet deadlines effectively, and that it significantly outperforms previous protocols in the cloud data center environment.


Tsinghua University Press