[Cake] lan keyword affects host fairness

[Jonathan Morton]

This is most likely an interaction of the AQM with Linux' scheduling
latency.

At the 'lan' setting, the time comstants are similar in magnitude to the
delays induced by Linux itself, so congestion might be signalled
prematurely.  The flows will then become sparse and total throughput
reduced, leaving little or no back-pressure for the fairness logic to work
against.

For this reason, you might have better luck with the next higher RTT
setting.

- Jonathan Morton
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