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

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Fri, 01 December 2017 10:03 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "ecn-in-quic@ietf.org" <ecn-in-quic@ietf.org>
Thread-Topic: ECN ACK, bytes or packets
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Subject: [Ecn-in-quic] ECN ACK, bytes or packets
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Hi

At the ECN-QUIC side meeting it was discussed whether byte or packets counters are to prefer, but I don't think that we came to any conclusion.
In any case I have a few thoughts around this

+ Byte counter for CE but only packet counter for ECT(1) and ECT(0):
Now with draft-ietf-tsvwg-ecn-experimentation in its final stages, I don't see the benefit with counting number of bytes that are ECT(0) and ECT(1) marked as I think that this information is only used to check that packets are correctly marked/remarked. This would limit the size of the ECT(0) and ECT(1) fields quite small

+ Delta values: It was argued that ACKs are ACKed , this means that one can report deltas and thus potentially save some overhead. Reading section 8.14 in the quic transport draft I believe that I have convinced myself that this is indeed possible.

+ 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)

Comments are welcome
/Ingemar













==================================
Ingemar Johansson  M.Sc.
Master Researcher

Ericsson Research
Network Protocols & E2E Performance
Labratoriegränd 11
971 28, Luleå, Sweden
Phone +46-1071 43042
SMS/MMS +46-73 078 3289
ingemar.s.johansson@ericsson.com<mailto:ingemar.s.johansson@ericsson.com>
www.ericsson.com

The world is full of magical things patiently
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