Re: [quicwg/base-drafts] Rework section on persistent congestion (#3961)

[Jana Iyengar <[e-mail]>]

@janaiyengar commented on this pull request.



> +This design does not use consecutive PTO events to establish persistent
+congestion, since application patterns impact PTO expirations. For example, a
+sender that sends small amounts of data with silence periods between them
+restarts the PTO timer every time it sends, potentially preventing the PTO timer
+from expiring for a long period of time, even when no acknowledgments are being
+received. The use of a duration enables a sender to establish persistent
+congestion without depending on the occurrence of PTOs.
+
+### Establishing Persistent Congestion
+
+A sender establishes persistent congestion on receiving an acknowledgement if at
+least two ack-eliciting packets are declared lost, and:
+
+* a prior RTT sample existed when both packets were sent;
+
+* the duration between the send times of these two packets exceeds the

We can't require all packets between largest and smallest be acked; see my comment: https://github.com/quicwg/base-drafts/pull/3961#discussion_r463907388.

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