In this contribution we present analysis and simulation results on controlling TCP rates by buffer allocation. When segment loss is low, TCP throughput depends primarily on the TCP window size, and the round trip time of the connection. As a result, it is possible to control TCP rates with FIFO queuing. We present a buffer management policy called Differential Fair Buffer Allocation that provides loose rate guarantees to SACK TCP sources when the sum of the MCRs is significantly lower than the network capacity. We study the performance of differential fair buffer allocation by simulation.
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