Subject: [LOOPS] Narrowing the scope: (2) End-to-end assumptions and ECN

From: Carsten Bormann <[email-masked]>
Date: Tue, 26 May 2020 00:56:45 +0200

In tomorrow’s LOOPS side meeting, we want to discuss whether we can narrow the initial scope of the WG sufficiently that the resulting charter looks more tractable (we can then recharter after delivering on the initial scope).

The recovery performed by the LOOPS segment removes (or changes) the packet loss signal that is used for congestion control by the end-to-end traffic.

One proposal was to focus on end-to-end traffic that is ECN-enabled (ECT(0) traffic).
This would mean any congestion signal that LOOPS wants to provide could be relayed as CE marks, instead of potentially having to drop packets (which counteracts the objective of recovery)

What we don’t have good numbers for yet is how much traffic today is ECT(0) or could easily be made ECT(0) by removing some obstacles, enabling the use cases of LOOPS.

Comments are welcome on the list and/or in the meeting in ~16 hours.

Grüße, Carsten