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[quicwg/base-drafts] Reset min_rtt on persistent congestion (#3927)

Jana Iyengar <notifications@github.com> Tue, 21 July 2020 20:24 UTC

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Date: Tue, 21 Jul 2020 13:24:17 -0700
From: Jana Iyengar <notifications@github.com>
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Subject: [quicwg/base-drafts] Reset min_rtt on persistent congestion (#3927)
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@pravb wrote the following in his WGLC review (#3919):
```
Section 5.2 "If the path's actual RTT increases, the min_rtt will not adapt to it, allowing future RTT samples that are smaller than the new RTT be included in smoothed_rtt."

Would it safer to reset min_rtt after persistent congestion is declared. This is important so we can adapt to a consistent spike in RTT as a result of a path change.
```

Splitting this off from #3919 as a potential design issue. 

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