Re: [quicwg/base-drafts] recovery: clarification on TLP when sender is outpacing the timer (#1718)

[MikkelFJ <[e-mail]>]

Mmm - why doesn't RTO fire? If you do not get a timely ACK, you should retransmit? TLP just helps make that happen faster near the end. Retransmit can happen based on gaps in ACK or timeout, or both (from memory, spec keep changing). If you only rely on gap in ACK, then yes, it would not trigger, so that is a bad strategy to use exclusively unless you use an aggressive connection timeout.

I'm not sure the critical loss rate is documented explicitly - but perhaps a section is needed to discuss this further?  In any case, the loss rate is highly application specific because you might operate infiniband where minimal delays a considered critical and any loss unlikely, or you might be on domestic congested wifi with high loss rates, or on a satellite link with large RTT and possible large loss bursts. Loss can also happen from DoS attacks or on path attacks and may have to adjust to circumstances.

If both peers cooperate, a connection close should happen. If not, a timeout happens eventually, and and a stateless reset may happen much earlier when supported and when the path is still viable but the endpoint is not.

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