基于PFC优先级流控的数据中心无损网络传输控制机制研究

数据中心网络广泛采用基于优先级的流量控制(Priority-based Flow Control, PFC)机制来避免因缓存溢出而丢包。然而，PFC机制在保证无损传输的同时带来了队头阻塞和拥塞扩散等负面影响。本项目分析数据中心无损网络中PFC的特性，探索一套传输控制机制，来避免PFC的队头阻塞和拥塞扩散，满足数据中心各应用的传输延时需求。首先，基于数据中心的无损网络传输控制延时模型，研究延时敏感的拥塞反馈和速率控制策略；其次，从并行传输的角度研究感知路径差异的多路径传输控制机制；最后，针对拥塞流和非拥塞流，设计基于中间节点的流量隔离机制。通过解决这些科学问题，实现数据中心无损网络高效可靠的数据传输，保证数据中心应用服务的性能，对提升网络服务能力和用户体验具有重要价值和现实意义，同时对推动数据中心的研究发展具有重大意义。

Priority-based Flow Control (PFC) mechanism is widely deployed in data center network to avoid packet loss due to buffer overflow. Although PFC mechanism guarantees lossless transmission, it brings negative impacts such as head-of-line blocking and congestion spreading, etc. This project explores the characteristics of PFC mechanism in data center lossless network, and proposes the transport control schemes to avoid PFC’s head-of-line blocking and congestion spreading, and meet the delay requirements of various applications. Firstly, design the congestion feedback mechanism and rate control strategy based on the delay distribution of transport control in data center lossless network; Secondly, explore the delay-aware multipath transmission control mechanism; Finally, design the traffic isolation mechanism based on intermediate nodes for congested and uncongested flows. Solving these problems can provide effective and reliable transmission in data center lossless network and guarantee the performance of application services. It is of great value and practical significance to improve the network service ability, make a better experience for users, and substantially advance the research of data center.