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Go Back to Single Packet Number Space

Nick Banks <nibanks@microsoft.com> Wed, 25 July 2018 19:29 UTC

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From: Nick Banks <nibanks@microsoft.com>
To: IETF QUIC WG <quic@ietf.org>
Subject: Go Back to Single Packet Number Space
Thread-Topic: Go Back to Single Packet Number Space
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Date: Wed, 25 Jul 2018 19:29:41 +0000
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Hello Folks,

I have opened a GitHub Issue (#1579<https://github.com/quicwg/base-drafts/issues/1579>) and Pull Request (#1591<https://github.com/quicwg/base-drafts/pull/1591>) for this topic, but it seems progressed has stalled, so I figured I should take it to the list.

While implementing draft-13, I came across a number of pain points related to using multiple packet number spaces. A lot of the issues result in duplicated state (and associated memory) for all the packet number spaces. But more importantly, the multiple packet number spaces bring in a lot more complexity of logic, compared to the previous single packet number space design. There is a lot more detail in the GitHub issue, and I'd ask that folks take a look at it (and the PR) and provide any feedback they might have. I feel that my Issue adequately describes the problem and my PR provides good (if not better, IMO) solutions to the problems that were fixed previously with multiple packet number spaces. I believe having a single packet number space will drastically simplify implementations in the end.

Finally, as QUIC V1 (2?) is coming to a close (hopefully) I feel like we should resolve this issue soon. I don't want this issue to slip out into the next version.

Thanks,
- Nick

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