On TCP reaction to Explicit Congestion Notification

Authors:
Minseok Kwon;Sonia Fahmy
Affiliations:
Department of Computer Sciences, Purdue University, 250 N. University St., West Lafayette, IN 47907-2066, USA Tel.: +1 765 494-6183/ Fax: +1 765 494-0739/ E-mail: {kwonm,fahmy}@cs.purdue.edu;Department of Computer Sciences, Purdue University, 250 N. University St., West Lafayette, IN 47907-2066, USA Tel.: +1 765 494-6183/ Fax: +1 765 494-0739/ E-mail: {kwonm,fahmy}@cs.purdue.edu
Venue:
Journal of High Speed Networks
Year:
2004

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Abstract

We investigate the behavior of a new response strategy to TCP Explicit Congestion Notification (ECN). The new strategy is more aggressive in the short term, but preserves TCP long term behavior - without modifying the router ECN marking rate. A more aggressive short term behavior gives incentives for hosts to become ECN-compliant. ECN serves as an early warning sign in this case. Our analysis demonstrates the effectiveness of the new TCP ECN behavior. Simulation results with short/long lived FTP, UDP and HTTP connections, multiple bottleneck configurations, and various TCP flavors and parameters, demonstrate higher throughput and reduced oscillations with the new response strategy.