The Effects of Active Queue Management on Web Performance

L. Le, J. Aikat, K. Jeffay, F.D. Smith
Proceedings of ACM SIGCOMM 2003, Karlsruhe, Germany
August 2003, pages 265-276.

ABSTRACT: We present an empirical study of the effects of active queue man-agement (AQM) on the distribution of response times experienced by a population of web users. Three prominent AQM schemes are considered: the Proportional Integrator (PI) controller, the Random Exponential Marking (REM) controller, and Adaptive Random Early Detection (ARED). The effects of these AQM schemes were studied alone and in combination with Explicit Congestion Notification (ECN). Our major results are:

We conclude that without ECN there is little end-user performance gain to be realized by employing the AQM designs studied here. However, with ECN, response times can be significantly improved. In addition it appears likely that provider links may be operated at near saturation levels without significant degradation in user-perceived performance.

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