[quicwg/base-drafts] Sender-Controlled Delayed ACK Ratio (#1978)

[Bob Briscoe <[e-mail]>]

Yesterday Jana said the WG is open to the possibility of a sender-controlled ack_ratio. 

A simpler approach: a 3-bit field in each direction, in every packet, carrying ack_exp where 
> > ack_ratio` = 2^ack_exp.`
Exactly how many bits to use is up for discussion, but I believe ack_ratio=16 and growing is already common in DCs, so 2 bits isn't quite enough.

Receiving ack_exp would be defined to mean: "From now, please try to ACK at least every 2^ack_exp packets". No negotiation. No need to detect loss of messages. Just repetition of a hint.

Of course a variable can be constant, e.g. for implementers of a sender who want to leave adaptation code for later, just set ack_exp=1 in every packet.

I think this would address all the scenarios in #1428 (related but closed).


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