Tuning the Aggressive TCP Behavior for Highly Concurrent HTTP Connections in Data Center
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© 2016 IEEE. Modern data centers host diverse HTTP-based services, which employ persistent TCP connections to send HTTP requests and responses. However, the ON/OFF pattern of HTTP traffic disturbs the increase of TCP congestion window, potentially triggering packet loss at the beginning of ON period. Furthermore, the transmission performance becomes worse due to severe congestion in the concurrent transfer of HTTP response. In this work, we first reveal that the TCP's aggressive behavior in increasing congestion window causes TCP timeouts and throughput collapse. We further present the design and implementation of TCP-TRIM, which employs probe packets to smooth the aggressive increase of congestion window in persistent TCP connection, and leverages congestion detection and control at end-host to limit the growth of switch queue length under highly concurrent TCP connections. The experimental results of at-scale simulations and real implementations show that TCPTRIM reduces the completion time of HTTP response by up to 80%, while introducing little deployment overhead only at the end hosts.
author list (cited authors)
Huang, J., Wang, J., Zhang, T., Chen, J., & Pan, Y. i.