Re: [quicwg/base-drafts] pto_count should be reset when dropping a packet number space (#3272)

Kazuho Oku <> Fri, 29 November 2019 00:02 UTC

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Date: Thu, 28 Nov 2019 16:02:07 -0800
From: Kazuho Oku <>
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Subject: Re: [quicwg/base-drafts] pto_count should be reset when dropping a packet number space (#3272)
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> I think the behavior we're looking for is (i) use a separate pto_count per epoch, (ii) use the max of all pto_counts when setting the timer for any PN space, (iii) reset all pto_counts when an ACK is received for any epoch.
> This isn't great, and it is imperfect -- you can end up being more aggressive than with a single count. But I think it's good enough.

The logic you describe sounds fine to me (apparently I missed (ii)), it would make the PTO behavior during handshake _as aggressive as_ after the handshake. I cannot see when it would be more aggressive than that, and I think it's better than "imperfect but good enough."

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