[Bloat] benefits of ack filtering

[Jonathan Morton]

Given an RTT estimate and knowledge of the congestion window, the AckCC
option could be used to target a handful of acks (maybe 4 to 10) per RTT.
As usual, extra acks would be sent when loss is suspected, on ECN events,
and when the push flag is set.

That would be perfectly sufficient.

- Jonathan Morton
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