Re: [tsvwg] Prague requirements survey

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 10 February 2021 09:09 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: "De Schepper, Koen (Nokia - BE/Antwerp)" <koen.de_schepper@nokia-bell-labs.com>, tsvwg IETF list <tsvwg@ietf.org>
Thread-Topic: Prague requirements survey
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Date: Wed, 10 Feb 2021 09:09:22 +0000
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Subject: Re: [tsvwg] Prague requirements survey
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Hi

Please see inline

/Ingemar

 

From: De Schepper, Koen (Nokia - BE/Antwerp)
<koen.de_schepper@nokia-bell-labs.com> 
Sent: den 8 februari 2021 14:37
To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>om>; tsvwg IETF list
<tsvwg@ietf.org>
Subject: RE: Prague requirements survey

 

Hi Ingemar,

 

Thanks for your contributions. I linked your doc to the
https://l4steam.github.io/#prague-requirements-compliance
<https://protect2.fireeye.com/v1/url?k=ae271499-f1bc2db2-ae275402-866038973a
15-a6d18987ee63d9e2&q=1&e=4b98878d-2d51-48b6-9518-92696e72501d&u=https%3A%2F
%2Fl4steam.github.io%2F%23prague-requirements-compliance>  web page (and
will do so for others).

[IJ] OK, great!

 

I didn't see any issues or objections mentioned to the current requirements
as specified in the draft. Does this mean you think they are all reasonable,
valid and feasible?

[IJ] There is a slight possibility that I misunderstood parts of the layout.
Even though SCReAM is only partially compliant in many cases I believe that
requirements are reasonable.  

 

Interesting observation (related to the performance optimization topic 1)
that for the control packets "RTCP is likely not using ECT(1)". Why is this
not likely? I assume this will impact the performance? Do we need to
recommend the use of ECT(1) on RTCP packets in the draft?

[IJ] Upon first glance I don't see that it is beneficial that RTCP packets
are ECT(1). But of course there is a possibility that RTCP packets go into a
queue with higher latency and that may affect performance. So. perhaps it is
reasonable that RTCP packets are ECT(1) too, but these are then to be
regarded as non queue building as it can be hard to rate control RTCP.

 

Thanks,

Koen.

 

From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com
<mailto:ingemar.s.johansson@ericsson.com> > 
Sent: Monday, February 8, 2021 10:59 AM
To: De Schepper, Koen (Nokia - BE/Antwerp)
<koen.de_schepper@nokia-bell-labs.com
<mailto:koen.de_schepper@nokia-bell-labs.com> >; tsvwg IETF list
<tsvwg@ietf.org <mailto:tsvwg@ietf.org> >
Cc: Ingemar Johansson S <ingemar.s.johansson@ericsson.com
<mailto:ingemar.s.johansson@ericsson.com> >
Subject: RE: Prague requirements survey

 

Hi

Please find attached (hopefully) a Prague requirements survey applied to
SCReAM (RFC8298 std + running code)

 

Regards
Ingemar

 

From: tsvwg <tsvwg-bounces@ietf.org <mailto:tsvwg-bounces@ietf.org> > On
Behalf Of De Schepper, Koen (Nokia - BE/Antwerp)
Sent: den 6 februari 2021 23:20
To: tsvwg IETF list <tsvwg@ietf.org <mailto:tsvwg@ietf.org> >
Subject: [tsvwg] Prague requirements survey

 

Hi all,

 

To get a better understanding on the level of consensus on the Prague
requirements, we prepared an overview document listing the L4S-ID draft
requirements specific to the CC (wider Prague requirements), as a
questionnaire towards potential CC developers. If you are developing or have
developed an L4S congestion control, you can describe the status of your
ongoing development in the second last column. If you cannot share status,
or plan-to/would implement an L4S CC, you can list what you would want to
support (see feasible). In the last column you can put any
description/limitations/remarks/explanations related to evaluations,
implementations and/or plans (will implement or will not implement). Any
expected or experienced issues and any objections/disagreements to the
requirement can be explained and colored appropriately.

 

The document can be found on following link:
https://raw.githubusercontent.com/L4STeam/l4steam.github.io/master/PragueReq
s/Prague_requirements_Compliance_and_Objections_template.docx
<https://protect2.fireeye.com/v1/url?k=d16bc960-8ef0f066-d16b89fb-86ee86bd51
07-080c65bfd839440d&q=1&e=7dbb7494-67c3-4315-88a6-325f32e4e8b1&u=https%3A%2F
%2Fraw.githubusercontent.com%2FL4STeam%2Fl4steam.github.io%2Fmaster%2FPrague
Reqs%2FPrague_requirements_Compliance_and_Objections_template.docx> 

 

As an example I filled it for the Linux TCP-Prague implementation on
following link:
https://l4steam.github.io/PragueReqs/Prague_requirements_Compliance_and_Obje
ctions_Linux_TCP-Prague.docx
<https://protect2.fireeye.com/v1/url?k=f839c5f7-a7a2fcf1-f839856c-86ee86bd51
07-29dabadc5d0e673d&q=1&e=7dbb7494-67c3-4315-88a6-325f32e4e8b1&u=https%3A%2F
%2Fl4steam.github.io%2FPragueReqs%2FPrague_requirements_Compliance_and_Objec
tions_Linux_TCP-Prague.docx> 

 

Please send your filled document to the list (Not sure if an attachment will
work, so I assume you also need to store it somewhere and send a link to it,
or send to me directly). 

 

We hope to collect many answers, understanding the position of the different
(potential) implementers and come faster to consensus.

 

Thanks,

Koen.