[Bloat] TCP congestion detection - random thoughts

[Jonathan Morton]

There are also a couple of TCPs that are sensitive to the RTT signal in the
way you describe, but don't completely stop their window increases, in
order to avoid being permanently outcompeted. Illinois is in Linux, and
Compound TCP is a Microsoft thing.

Also noteworthy is Westwood+, which uses RTT and window size to compute
available bandwidth, then upon receiving a congestion signal it uses the
minimum RTT and the bandwidth to infer the correct new window size rather
than blindly halving it. This actually works pretty well with AQM's
preference for short queues, without sacrificing bandwidth; the main
shortcoming is that the smoothed bandwidth estimate tends to be an
underestimate during the early phases of the connection, ie at the critical
moment of exiting slow start.

- Jonathan Morton
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