Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)

martinduke <> Mon, 30 March 2020 17:01 UTC

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Subject: Re: [quicwg/base-drafts] Required state for retaining unacked RETIRE_CONNECTION_ID frames is unbound (#3509)
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What a mess we've made! Is there interest in doing a Zoom about this? Maybe 0900 Tokyo/1100 Sydney/1700 Seattle/2000 Boston on Tue/Wed?

The root cause is that the flow control mechanism isn't all that well designed. IMO #3553 is the actual correct fix to this problem, but as people say, it's disruptive.

#3548 uses ACKs as an implicit signal, which seems like a problem. #3553 has a different implicit signal, and I don't think it solves the case where the client is withholding acks for unsolicited RCIDs.

I really think we should just use #3547 or #3553 depending on our appetite for changing the wire image. #3547 is great for the RCID sender, and if the receiver won't miss any RCIDs unless it's doing pathological stuff or the ack loss patterns are tremendously unlucky.

#3553, OTOH, is a comprehensive fix to the problem.

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