The IESG has approved the following document: - 'Low Extra Delay Background Transport (LEDBAT)' (draft-ietf-ledbat-congestion-10.txt) as Experimental RFC This document is the product of the Low Extra Delay Background Transport Working Group. The IESG contact persons are Wesley Eddy and Martin Stiemerling. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-ledbat-congestion/ Technical Summary This document describes an experimental congestion algorithm for building a lower than best-effort transport. The algorithm attempts to use the residual capacity on an end-to-end path while limiting queuing delay. The algorithm sense increase in one-way delay measurements to yield in the presence of any competing flows thus limiting interference with the network performance of competing flows. Working Group Summary We reached consensus on the basic algorithm a long while back while most of the later revisions and discussions were around parameterization and choosing the right defaults. This is expected as this is an experimental algorithm and data needs to guide these decisions rather than theory. In the end we got enough (independent) experimental data that guided the design decisions. Document Quality There are several independent implementations including BitTorrent itself which pioneered this algorithm and ship it in their product. A number of universities and more recently Apple prototyped and shared results during the last call. I am confident that parameterization and associated tradeoffs are well understood and documented. Personnel Murari Sridharan (muraris@microsoft.com) is the document shepherd. Wesley Eddy (wes@mti-systems.com) is the responsible AD.
