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

IngJohEricsson <notifications@github.com> Wed, 05 December 2018 07:47 UTC

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Subject: Re: [quicwg/base-drafts] Sender-Controlled Delayed ACK Ratio (#1978)
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A bit late into this discussion. 
Have you discussed something like two dimensionless parameters K and N
Where 
MaxAckDelay = RTT/K
MaxPacketsBeforeAck = N

The values K and N are signaled/negotiated between the peers. Suggested default values would be K=4 and N=10  or whatever is deemed as proper.
One issue I see is that RTT may be unknown in the (first part of) the initial handshake. And then one can discuss if it should be RTT or SRTT.. 
One positive property (as I see it) is that we avoid fixing ourselves into discussions about time unit and that can be good as QUIC may be used in long haul as well as data center applications. 

/Ingemar

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