TCP Vegas: new techniques for congestion detection and avoidance
SIGCOMM '94 Proceedings of the conference on Communications architectures, protocols and applications
Modeling TCP throughput: a simple model and its empirical validation
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Emulating low-priority transport at the application layer: a background transfer service
Proceedings of the joint international conference on Measurement and modeling of computer systems
Modeling and performance analysis of BitTorrent-like peer-to-peer networks
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
TCP Nice: a mechanism for background transfers
OSDI '02 Proceedings of the 5th symposium on Operating systems design and implementationCopyright restrictions prevent ACM from being able to make the PDFs for this conference available for downloading
Improving Traffic Locality in BitTorrent via Biased Neighbor Selection
ICDCS '06 Proceedings of the 26th IEEE International Conference on Distributed Computing Systems
TCP-LP: low-priority service via end-point congestion control
IEEE/ACM Transactions on Networking (TON)
Skype video responsiveness to bandwidth variations
Proceedings of the 18th International Workshop on Network and Operating Systems Support for Digital Audio and Video
Detailed analysis of Skype traffic
IEEE Transactions on Multimedia
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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Since December 2008, the official BitTorrent client is using a new congestion-control protocol for data transfer, implemented at the application layer and built over UDP at the transport-layer: this new protocol undergoes the name of LEDBAT, for Low Extra Delay Background Transport. In this paper, we study different flavors of the LEDBAT protocol, corresponding to different milestones in the BitTorrent software evolution, by means of an active testbed. Focusing on single flow scenario, we investigate emulated artificial network conditions, such as additional delay and capacity limitation. Then, in order to better grasp the potential impact of LEDBAT on the current Internet traffic, we consider a multiple flows scenario, and investigate the performance of a mixture of TCP and LEDBAT flows, so to better assess what "lower-than best effort" means in practice. Our results show that LEDBAT has already fulfilled some of its original design goals, though some issues still need to be addressed.