A Virtual Loss-Load Congestion Control Strategy for High Speed Networks

摘要

This paper evaluates a hybrid congestion control strategy called the Virtual Loss-Load model. The approach combines the leaky bucket traffic shaper (a preventive congestion control mechanism) with the loss-load model (a reactive congestion control mechanism). Simulation is used to evaluate the virtual loss-load model, and to compare its performance to that of other reactive congestion control strategies from the literature. The evaluation is done using a benchmark suite of network scenarios proposed by Kanakia, Keshav and Mishra. The performance metrics used in the evaluation are file transfer time and packet loss probability. The simulation results show that the virtual loss-load model is an effective congestion control strategy, providing performance comparable to several other reactive congestion control strategies. While transient effects due to dynamic changes in cross traffic result in significantly higher packet loss than expected in the virtual loss-load model, the parameters of the virtual loss-load model make it directly tunable to trade off packet loss and file transfer time.