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Part 7: TCPInternational audienceTraditional loss-based TCP congestion control (CC) tends to induce high queuing delays and perform badly across paths containing links that exhibit packet losses unrelated to congestion. Delay-based TCP CC algorithms infer congestion from delay measurements and tend to keep queue lengths low. To date most delay-based CC algorithms do not coexist well with loss-based TCP, and require knowledge of a network path’s RTT characteristics to establish delay thresholds indicative of congestion. We propose and implement a delay-gradient CC algorithm (CDG) that no longer requires knowledge of path-specific minimum RTT or delay thresholds. Our FreeBSD implementation is shown to coexist reasonably with loss-based TCP (NewReno) in lightly multiplexed environments, share capacity fairly between instances of itself and NewReno, and exhibits improved tolerance of non-congestion related losses (86% better goodput than NewReno in the presence of 1% packet losses)

Revisiting TCP Congestion Control Using Delay Gradients