The Effects of Active Queue Management and Explicit Congestion Notification on Web Performance

L. Le, J. Aikat, K. Jeffay, F.D. Smith
IEEE/ACM Transactions on Networking
Volume 15, Number 6, December 2007
pages 1217-1230.

ABSTRACT: We present an empirical study of the effects of active queue management (AQM) and explicit congestion notification (ECN) on the distribution of response times experienced by a population of users browsing the Web. Three prominent AQM schemes are considered: the Proportional Integral (PI) controller, the Random Exponential Marking (REM) controller, and Adaptive Random Early Detection (ARED). The effects of these AQM schemes were studied with and without ECN. Our primary measure of performance is the end-to-end response time for HTTP request-response exchanges. For this measure, our major results are:

We conclude that AQM can improve application and network performance for Web or Web-like workloads. In particular, it appears likely that with AQM and ECN, provider links may be operated at near saturation levels without significant degradation in user-perceived performance.

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