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Re: [Ecn-in-quic] ECN ACK, bytes or packets

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Fri, 01 December 2017 12:45 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "Eggert, Lars" <lars@netapp.com>
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Thread-Topic: [Ecn-in-quic] ECN ACK, bytes or packets
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Subject: Re: [Ecn-in-quic] ECN ACK, bytes or packets
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Hi
Yes, my intention was to highlight the use of variable-length integer encoding. Obviously it was not that clear 😊
/Ingemar

From: Eggert, Lars [mailto:lars@netapp.com]
Sent: den 1 december 2017 11:23
To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Cc: ecn-in-quic@ietf.org
Subject: Re: [Ecn-in-quic] ECN ACK, bytes or packets

On 2017-12-1, at 11:02, Ingemar Johansson S <ingemar.s.johansson@ericsson.com<mailto:ingemar.s.johansson@ericsson.com>> wrote:
+ If the two tweaks above are possible then we would end up with something like
  + 1 byte for ECT(0), with the special 2 bit encoding we are then able to encode a delta of [0…63] ECT(0] marked packets
  + 1 byte for ECT(1), same encoding as above.
  + 2 or 4 bytes for CE, the most likely encoding that makes it possible to encode a delta of [0..16383] CE marked bytes or [0...2*30-1], the latter is more likely used with large MTU sizes and in some cases also when packets are densely marked (L4S)

We are going to varint encoding almost everywhere in QUIC; see https://quicwg.github.io/base-drafts/draft-ietf-quic-transport.html#rfc.section.8.1

Lars

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