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Harmonia: Explicit Congestion Notification and credit-reservation Transport Converged Congestion Control in Datacenters

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Journal of Computer Science & Technology 2021年第5期36卷 1071-1086页

作者： Ding-Huang Hu De-Zun Dong Yang Bai Shan Huang Ze-Jia Zhou Zi-Hao Wei Xiang-Ke Liao College of Computer Science and Technology National University of Defense TechnologyChangsha 410073China

Bursty traffic and thousands of concurrent flows incur inevitable network congestion in datacenter networks(DCNs)and then affect the overall *** transport protocols are developed to mitigate the network congestion,including reactive and proactive *** schemes use different congestion signals,such as explicit congestion notification(ECN)and round trip time(RTT),to handle the network congestion after congestion ***,with the growth of scale and link speed in datacenters,reactive schemes encounter a significant problem of slow responding to *** the contrary,proactive protocols(e.g.,credit-reservation protocols)are designed to avoid congestion before it occurs,and they have the advantages of zero data loss,fast convergence and low buffer *** credit-reservation protocols have not been widely deployed in current DCNs(e.g.,Microsoft,Amazon),which mainly deploy ECN-based protocols,such as data center transport control protocol(DCTCP)and data center quantized congestion notification(DCQCN).And in an actual deployment scenario,it is hard to guarantee one protocol to be deployed in every server at one *** credit-reservation protocol is deployed to DCNs step by step,the network will be converted to multi-protocol state and will face the following fundamental challenges:1)unfairness,2)high buffer occupancy,and 3)heavy tail ***,we propose Harmonia,aiming for converging ECN-based and credit-reservation protocols to fairness with minimal *** the best of our knowledge,Harmonia is the first to address the trouble of harmonizing proactive and reactive congestion *** the common ECN-based protocols-DCTCP and DCQCN,Harmonia leverages forward ECN and RTT to deliver real-time congestion information and redefines feedback *** the evaluation,the results show that Harmonia effectively solves the unfair link allocation,eliminating the timeouts and addressing the buffer overflow.

关键词： datacenter credit-reservation protocol ECN-based(explicit congestion notification based)protocol multiprotocol converging

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