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Re: [Ecn-in-quic] ECN in QUIC, quick review input wanted

"Eggert, Lars" <lars@netapp.com> Mon, 18 December 2017 14:53 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: Magnus Westerlund <magnus.westerlund@ericsson.com>
CC: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>, "ecn-in-quic@ietf.org" <ecn-in-quic@ietf.org>, Janardhan Iyengar <jri@google.com>, Ian Swett <ianswett@google.com>
Thread-Topic: [Ecn-in-quic] ECN in QUIC, quick review input wanted
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Date: Mon, 18 Dec 2017 14:53:24 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/ecn-in-quic/eYDPgdqItCZrbDrHvknLVUHpqDs>
Subject: Re: [Ecn-in-quic] ECN in QUIC, quick review input wanted
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On 2017-12-18, at 15:19, Magnus Westerlund <magnus.westerlund@ericsson.com> wrote:
> Frankly I don't quite understand why ACK and ECN must be in the same Frame. Yes, they need to be in the same IP packet, and have corresponding information coverage to make them useful. But, that I don't see require combined frames. What am I missing? Is it the case of retransmitting ACK frames, where one may have multiple ACK Frames from different times in the same frame alternatively, need to re-encode the corresponding ACK interval into one new frame?

ACK frames are never RTXed, see https://quicwg.github.io/base-drafts/draft-ietf-quic-transport.html#rfc.section.9

Lars

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