Because of the terrible performance of TCP protocol
\nin data center environment, DCTCP has been proposed as
\na TCP replacement, which uses a simple marking mechanism
\nat switches and a few amendments at end hosts to adjust
\ncongestion window based on the extent of the congestion in
\nnetworks. Thus, DCTCP can make a proper tradeoff between
\nhigh throughput and low latency. However, through our observation,
\nwe discover that DCTCP causes severe oscillation of
\nqueue under some parameters and network configuration. Our
\nperceptual analysis concludes that the rough single-threshold
\nmarking mechanism may be the essential reason. Therefore,
\nwe propose Double-Threshold DCTCP as an improvement of
\nDCTCP. Then, by applying describing function method in nonlinear
\ncontrol theory, we analyze the stability of both DCTCP
\nand Double-Threshold DCTCP, and theoretically explain why
\nDouble-Threshold DCTCP is more stable than DCTCP. At last,
\nwe validate theoretical analysis and conclude that the Double-
\nThreshold DCTCP can achieve smaller queue, and the queue
\nlength of Double-Threshold DCTCP is less sensitive to the
\ngrowing number of flows. Further, Double-Threshold DCTCP
\ncan postpone the throughput collapse caused by Incast traffic
\nand reduce the tail latency in completion time experiment.<\/p>\n","protected":false},"excerpt":{"rendered":"
Because of the terrible performance of TCP protocol in data center environment, DCTCP has been proposed as a TCP replacement, which uses a simple marking mechanism at switches and a few amendments at end hosts to adjust congestion window based on the extent of the congestion in networks. Thus, DCTCP can make a proper tradeoff 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