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[QUIC] QUIC ACK frames and one-way transfer time (was RE: Drafts structure and split)

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 26 October 2016 11:07 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Ryan Hamilton <rch@google.com>, Jim Roskind <JimRoskind@gmail.com>
Thread-Topic: QUIC ACK frames and one-way transfer time (was RE: [QUIC] Drafts structure and split)
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Cc: Ian Swett <ianswett@google.com>, Kyle Rose <krose@krose.org>, Christian Huitema <huitema@huitema.net>, Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>, marcelo bagnulo braun <marcelo@it.uc3m.es>, Jana Iyengar <jri@google.com>, "quic@ietf.org" <quic@ietf.org>
Subject: [QUIC] QUIC ACK frames and one-way transfer time (was RE: Drafts structure and split)
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Hi

Ryan. You are right that the QUIC ACK frames already contains the necessary information to compute the one way delay. It is of course not possible to deduce the true one way delay unless the sender and receiver clocks are synchronized. What is easy to determine is the queue delay that can be used in a way similar to how LEDBAT does it, there are some pros and cons with that approach.
https://datatracker.ietf.org/doc/draft-johansson-cc-for-4g-5g/ describes a modification to Cubic that is based on this principle.

/Ingemar


From: Ryan Hamilton [mailto:rch@google.com]
Sent: den 26 oktober 2016 06:09
To: Jim Roskind <JimRoskind@gmail.com>
Cc: Ian Swett <ianswett@google.com>; Kyle Rose <krose@krose.org>; Christian Huitema <huitema@huitema.net>; Spencer Dawkins at IETF <spencerdawkins.ietf@gmail.com>; marcelo bagnulo braun <marcelo@it.uc3m.es>; Jana Iyengar <jri@google.com>; quic@ietf.org
Subject: Re: [QUIC] Drafts structure and split



On Tue, Oct 25, 2016 at 7:13 PM, Jim Roskind <JimRoskind@gmail.com<mailto:JimRoskind@gmail.com>> wrote:
On Mon, Oct 24, 2016 at 5:31 PM, Ian Swett <ianswett@google.com<mailto:ianswett@google.com>> wrote:
...
It's worth noting that BBR is only a change to the congestion controller, ....



BBR relies on getting estimates of transit time, so as to estimate variations in buffer sizes.  As a relatively rough estimate, I believe BBR in TCP relies on traditional-TCP RTT calculations, which includes the round trip sum of transit times in both directions.  I expect that better one-way transit time estimates can be harvested in QUIC, by changing the data included in ACK frames to better illuminate transit times in each directions (or more precisely, illuminate changes, from one packet to the next, in one-way transit times).

​Correct me if I'm wrong, but QUIC ACK frames already have this information. The contain the arrival time of each packet at the peer, which provides the one-way transfer time.
​

 Such modifications appear at first blush to be notably larger than just a change to the congestion controller.

Similarly, I'd expect modifications to support ECN in QUIC to run much deeper than a congestion controller.

Jim

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