Evaluation of different decrease schemes for LEDBAT congestion control
EUNICE'11 Proceedings of the 17th international conference on Energy-aware communications
Experimental assessment of bittorrent completion time in heterogeneous TCP/uTP swarms
TMA'12 Proceedings of the 4th international conference on Traffic Monitoring and Analysis
Delay-based congestion control: Flow vs. BitTorrent swarm perspectives
Computer Networks: The International Journal of Computer and Telecommunications Networking
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Last year, the official BitTorrent client switched to LEDBAT, a new congestion control algorithm targeting a lower-than Best Effort transport service. In this paper, we study this new protocol through packet-level simulations, with a special focus on a performance comparison with other lower-than Best Effort protocols such as TCP-LP and TCP-NICE: our aim is indeed to quantify and relatively weight the level of Low-priority provided by such protocols. Our results show that LEDBAT transport generally achieves the lowest possible level of priority, with the default configurations of TCP-NICE and TCP-LP representing increasing levels of aggressiveness. In addition, we perform a careful sensitivity analysis of LEDBAT performance, by tuning its main parameters in both an inter-protocol (against TCP) and intra-protocol (against LEDBAT itself) scenarios. In the inter-protocol case, even in case of misconfiguration LEDBAT competes as aggressively as TCP, but we show that it is not possible to achieve an arbitrary level of low-priority by merely tuning its parameters. In the intra-protocol case, we show that coexistence of legacy flows with slightly dissimilar settings, or experiencing different network conditions, can result in significant unfairness.