Abstract: In order to evaluate the performance of AQM(Active Qucuc Management) algorithms,an extended qucueing system was developed by embedding an AQM algorithm into the queueing system GIX/M/1/N. Using this model and the self-similar traffic of the Internet, a novel approach was proposed to analyze the performance of AQM algorithms with unresponsive traffic. Four classical AQM algorithms TD, RED, GRED and Adaptive RED were assessed by this approach. A series simulation was performed using NS2 to verify the correctness of this approach. The simulation resups arc consists with those obtained by this approach. This fact shows that the extended queucing system GIx/M/1/N can be used to evaluate the performance of AQM algorithms.

Key words: Computer network, AQM, Congestion control, GIX/M/1/N, Thinning of input flows, Self-similar traffic, Heavy-tailed distribution