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Re: [quicwg/base-drafts] No RTT samples, no persistent congestion (#3889)

Kazuho Oku <notifications@github.com> Wed, 22 July 2020 05:58 UTC

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Date: Tue, 21 Jul 2020 22:58:17 -0700
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] No RTT samples, no persistent congestion (#3889)
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@kazuho commented on this pull request.



> @@ -1581,6 +1588,10 @@ Invoked when DetectAndRemoveLostPackets deems packets lost.
 
 ~~~
    InPersistentCongestion(lost_packets):

@marten-seemann It is impossible to rely on `largest_acked_packet_send_time`, because an ACK on another PN space might have arrived later than the persistent congestion period to be declared. See the example below.

![IMG_3331](https://user-images.githubusercontent.com/41567/88139839-81b4ef00-cc2b-11ea-8c19-90abd434ed91.jpeg)

As stated in https://github.com/quicwg/base-drafts/pull/3889#discussion_r458524100, I do not think it is possible can use `loss_packets`, unless you implement some lossy behavior to bound state.

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