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Re: [tsvwg] New rev of draft-ietf-tsvwg-ecn-l4s-id-17

"Tilmans, Olivier (Nokia - BE/Antwerp)" <olivier.tilmans@nokia-bell-labs.com> Wed, 26 May 2021 15:22 UTC

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From: "Tilmans, Olivier (Nokia - BE/Antwerp)" <olivier.tilmans@nokia-bell-labs.com>
To: Jonathan Morton <chromatix99@gmail.com>
CC: "tsvwg@ietf.org" <tsvwg@ietf.org>
Thread-Topic: [tsvwg] New rev of draft-ietf-tsvwg-ecn-l4s-id-17
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Date: Wed, 26 May 2021 15:22:18 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/AWT5_vyDa-yMGL9ccOY7RJ3H6lQ>
Subject: Re: [tsvwg] New rev of draft-ietf-tsvwg-ecn-l4s-id-17
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Hi Jonathan,

 > Checking the code in sch_dualpi2.c, I find that the default target delay
 > is indeed 15ms.  However, this still results in a *median* delay of 25ms
 > when used with CUBIC.  Not 99+%ile, but MEDIAN.  It's not my place to
 > figure out how that happens, precisely, just to observe that it does.  So
 > there is basically 25ms of delay *difference* between the L and C queues,
 > and that is what I based my analysis on.

Given the open-source code has not been touched in over a year, this seems
surprising. Could you point to where you see such behavior? Given the large
amount of results over various repository, I have probably missed the
experiment you are referring to here.

A glance at your one-year old results does not show this (e.g. [1]).
The secondary Y axis on your more recent results seems off so is not
helping here (e.g., [2]). However, the reported tcp_metrics after
experiments look fine, e.g., 34ms on a 20ms base rtt [3], 21ms on a
10ms base rtt [4]. But I am not sure I'd trust the metric cache seeing
how many teardown logs only report the base RTT as srtt.


Best,
Olivier


[1] http://sce.dnsmgr.net/results/ect1-2020-04-23-final/l4s-s2-twoflow/l4s-s2-twoflow-ns-cubic-vs-prague-dualpi2-20ms_tcp_delivery_with_rtt.svg
[2] http://sce.dnsmgr.net/results/l4s-2020-11-11T120000-final/l4s-s1-rttfair/l4s-s1-rttfair-ns-cubic-vs-cubic-dualpi2-50Mbit-20ms-20ms_tcp_delivery_with_rtt.svg
[3] http://sce.dnsmgr.net/results/l4s-2020-11-11T120000-final/l4s-s1-rttfair/batch-l4s-s1-rttfair-ns-cubic-vs-cubic-dualpi2-50Mbit-20ms-20ms.teardown.log
[4] http://sce.dnsmgr.net/results/l4s-2020-11-11T120000-final/l4s-s1-rttfair/batch-l4s-s1-rttfair-ns-cubic-vs-cubic-dualpi2-50Mbit-10ms-10ms.teardown.log

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