RE: draft-lubashev-quic-partial-reliability

[Mikkel Fahnøe Jørgensen <[e-mail]>]

Another thought:

The partial reliability problem is really like a reverse ACK problem.
You can send a frame similar to ACK, be referring to you own streams rather
than the peers packets. For any stream where the conceptual MIN_STREAM_DATA
is 0, not transmission is made. Otherwise all unclosed streams have an
entry in a frame carrying many streams at once. This might be delivered
unreliable similar to ACK, since old reverse ACK are not that interesting.

You loose some details about sent vs unsent, but peer can deduce that
because a stream does not have gaps. (A stream could pretend to have lost
some data by never sending it if it gets behind, it it is the same thing).

This would use much less space achieving largely the same concept as with
MIN_STREAM_DATA frames for one stream at time.

Kind Regards,
Mikkel Fahnøe Jørgensen


On 19 December 2017 at 18.22.16, Lucas Pardue ([e-mail])
wrote:

Mikkel wrote:



> As to client vs server asymmetri: It strongly suggest not to make a
distinction here because there are many symmetric peer to peer use cases
and also opposite cases: server to client with partially reliable video,
client to server with partially reliable game state, server to server with
partially reliable gossip protocol to statistically advance a common state
(e.g. "I have processed so many bytes now, how about you?”).



Yes, early specialisation is a route to disappointment. There are other
discussions around unnecessary asymmetry at this level.



Regards

Lucas



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