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ICTCP: Incast Congestion Control for TCP in Data-Center Networks

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4 Author(s)
Haitao Wu ; Wireless & Networking Group, Microsoft Res. Asia (MSRA), Beijing, China ; Zhenqian Feng ; Chuanxiong Guo ; Yongguang Zhang

Transport Control Protocol (TCP) incast congestion happens in high-bandwidth and low-latency networks when multiple synchronized servers send data to the same receiver in parallel. For many important data-center applications such as MapReduce and Search, this many-to-one traffic pattern is common. Hence TCP incast congestion may severely degrade their performances, e.g., by increasing response time. In this paper, we study TCP incast in detail by focusing on the relationships between TCP throughput, round-trip time (RTT), and receive window. Unlike previous approaches, which mitigate the impact of TCP incast congestion by using a fine-grained timeout value, our idea is to design an Incast congestion Control for TCP (ICTCP) scheme on the receiver side. In particular, our method adjusts the TCP receive window proactively before packet loss occurs. The implementation and experiments in our testbed demonstrate that we achieve almost zero timeouts and high goodput for TCP incast.

Published in:

Networking, IEEE/ACM Transactions on  (Volume:21 ,  Issue: 2 )