LEDBAT is a congestion control mechanism made for applications, like peer-to-peer file transfers or software updates, that can easily saturate an end user’s Internet access. LEDBAT was designed with minimizing delay as its main goal, hence, to have as little an impact as possible on users’ applications that are sensitive to delay. This includes not only Internet telephony and videoconferencing, but also interactive web browsing. RITE members David Ros and Michael Welzl have investigated how well LEDBAT works, in terms of added latency. Their main conclusion is that LEDBAT may not be as innocuous as it should be — in some circumstances, it can even produce more delay that standard TCP, and it may noticeably degrade users’ quality of experience. The authors believe thus that LEDBAT should be replaced with a better alternative.
Find the paper here.