Re: [quicwg/base-drafts] Persistent Congestion Time Threshold (#2365)

[MikkelFJ <[e-mail]>]

mikkelfj commented on this pull request.



> -kPersistentCongestionThreshold, see {{cc-consts-of-interest}}), the network is
-considered to be experiencing persistent congestion, and the sender's congestion
-window MUST be reduced to the minimum congestion window (kMinimumWindow).  This
-response of collapsing the congestion window on persistent congestion is
-functionally similar to a sender's response on a Retransmission Timeout (RTO) in
-TCP {{RFC5681}}.
-
+## Persistent Congestion
+
+The network is considered to be experiencing persistent congestion when the
+sender goes a period of time without receiving any ACK frames for its in-flight,
+ack-eliciting packets.  Generally, this can be calculated as a number of
+consecutive PTOs (pto_count is more than  kPersistentCongestionThreshold, see
+{{cc-consts-of-interest}}), but since the PTO timer is reset when a new
+ack-eliciting packet is sent, an explicit time out must be used to account for
+those cases where PTOs don't occur.

```suggestion
those cases where PTOs do not occur.
```

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