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

Jana Iyengar <notifications@github.com> Wed, 29 July 2020 01:39 UTC

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Date: Tue, 28 Jul 2020 18:39:06 -0700
From: Jana Iyengar <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Rework section on persistent congestion (#3961)
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@janaiyengar commented on this pull request.



> +The RECOMMENDED value for kPersistentCongestionThreshold is 3, which is
+approximately equivalent to two TLPs before an RTO in TCP.
+
+This design uses an explicit duration instead of consecutive PTO events since
+the PTO timer is restarted every time an ack-eliciting packet is sent. An
+application that sends data with silence periods can restart the PTO timer every
+time it sends, potentially preventing the PTO timer from expiring for a long
+period of time. A consequence of this design is that persistent congestion can
+be established without the occurrence of any PTOs.
+
+### Declaring Persistent Congestion
+
+A sender declares persistent congestion on receiving an acknowledgement, if the
+following conditions are true:
+
+* there are at least two ack-eliciting packets that are declared lost;

We could make it a separate condition

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