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Revisiting TCP Congestion Control Using Delay Gradients

Abstract : Traditional 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).
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David Hayes, Grenville Armitage. Revisiting TCP Congestion Control Using Delay Gradients. 10th IFIP Networking Conference (NETWORKING), May 2011, Valencia, Spain. pp.328-341, ⟨10.1007/978-3-642-20798-3_25⟩. ⟨hal-01597987⟩

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