The introduction of service differentiation in the Internet implies that the residual bandwidth available to best-effort traffic becomes highly variable. This paper explores the design of a rapidly-reactive congestion control framework, where the ECN-aware best-effort flows aggressively go after any unused capacity. By making routers mark packets in a much more aggressive manner, the authors are able to achieve fast backoff in the network without resorting to TCP's current drastic step of halving the congestion window. Simulations indicate that the ECN-mod protocol is better than ECN-NewReno in exploiting rapid variations in the available bandwidth. Moreover, the milder backoff policy of ECN-mod also makes the link utilization less dependent on the exact values of the parameters in the router marking function.
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