无损以太网对于数据中心网络有着很强的吸引力,如今为了实现无损这一目的,诞生了很多新的拥塞控制协议如Data Center TCP(DCTCP)、Quantized Congestion Notification(QCN)、Data Center Quantized Congestion Notification(DCQCN)等。...无损以太网对于数据中心网络有着很强的吸引力,如今为了实现无损这一目的,诞生了很多新的拥塞控制协议如Data Center TCP(DCTCP)、Quantized Congestion Notification(QCN)、Data Center Quantized Congestion Notification(DCQCN)等。对DCTCP、DCQCN等拥塞控制算法进行仿真实验,分析不同的拥塞控制在数据中心网络模型中应对大量突发流的情况,并分析其中存在的拥塞扩散、发送源阻塞、死锁等问题。针对这些问题进行改进,提出融合控制拥塞通知(Fusion Control Congestion Notification,FCCN),以改善拥塞扩散和死锁问题,减少了拥塞控制的吞吐量损失。多次仿真结果表明提出的FCCN方法在不丢包的情况下应对的突发流达到DCTCP的1.5倍,同时突发流对于整个网络吞吐量的下降减少了20%,延迟减少了25%。展开更多
Network updates have become increasingly prevalent since the broad adoption of software-defined networks(SDNs)in data centers.Modern TCP designs,including cutting-edge TCP variants DCTCP,CUBIC,and BBR,however,are not ...Network updates have become increasingly prevalent since the broad adoption of software-defined networks(SDNs)in data centers.Modern TCP designs,including cutting-edge TCP variants DCTCP,CUBIC,and BBR,however,are not resilient to network updates that provoke flow rerouting.In this paper,we first demonstrate that popular TCP implementations perform inadequately in the presence of frequent and inconsistent network updates,because inconsistent and frequent network updates result in out-of-order packets and packet drops induced via transitory congestion and lead to serious performance deterioration.We look into the causes and propose a network update-friendly TCP(NUFTCP),which is an extension of the DCTCP variant,as a solution.Simulations are used to assess the proposed NUFTCP.Our findings reveal that NUFTCP can more effectively manage the problems of out-of-order packets and packet drops triggered in network updates,and it outperforms DCTCP considerably.展开更多
文摘无损以太网对于数据中心网络有着很强的吸引力,如今为了实现无损这一目的,诞生了很多新的拥塞控制协议如Data Center TCP(DCTCP)、Quantized Congestion Notification(QCN)、Data Center Quantized Congestion Notification(DCQCN)等。对DCTCP、DCQCN等拥塞控制算法进行仿真实验,分析不同的拥塞控制在数据中心网络模型中应对大量突发流的情况,并分析其中存在的拥塞扩散、发送源阻塞、死锁等问题。针对这些问题进行改进,提出融合控制拥塞通知(Fusion Control Congestion Notification,FCCN),以改善拥塞扩散和死锁问题,减少了拥塞控制的吞吐量损失。多次仿真结果表明提出的FCCN方法在不丢包的情况下应对的突发流达到DCTCP的1.5倍,同时突发流对于整个网络吞吐量的下降减少了20%,延迟减少了25%。
基金supportted by the King Khalid University through the Large Group Project(No.RGP.2/312/44).
文摘Network updates have become increasingly prevalent since the broad adoption of software-defined networks(SDNs)in data centers.Modern TCP designs,including cutting-edge TCP variants DCTCP,CUBIC,and BBR,however,are not resilient to network updates that provoke flow rerouting.In this paper,we first demonstrate that popular TCP implementations perform inadequately in the presence of frequent and inconsistent network updates,because inconsistent and frequent network updates result in out-of-order packets and packet drops induced via transitory congestion and lead to serious performance deterioration.We look into the causes and propose a network update-friendly TCP(NUFTCP),which is an extension of the DCTCP variant,as a solution.Simulations are used to assess the proposed NUFTCP.Our findings reveal that NUFTCP can more effectively manage the problems of out-of-order packets and packet drops triggered in network updates,and it outperforms DCTCP considerably.
