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Re: [tcpm] [tsvwg] L4S related activity in 3GPP

"Holland, Jake" <jholland@akamai.com> Sat, 09 November 2019 22:45 UTC

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From: "Holland, Jake" <jholland@akamai.com>
To: Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>, Sebastian Moeller <moeller0@gmx.de>
CC: "tcpm@ietf.org" <tcpm@ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>, "iccrg@irtf.org" <iccrg@irtf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>, "koen.de_schepper@nokia.com" <koen.de_schepper@nokia.com>
Thread-Topic: [tsvwg] L4S related activity in 3GPP
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Date: Sat, 09 Nov 2019 22:44:54 +0000
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Subject: Re: [tcpm] [tsvwg] L4S related activity in 3GPP
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On 2019-11-09, 11:24, "Ingemar Johansson S" <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org> wrote:
> One being that it can enable congestion control algorithms to
> quickly grab free capacity. 5G access can have large variations
> in link throughput for example related to dual connectivity and
> L4S can be helpful here as well.

Hi Ingemar,

Not sure how closely you've been following, but the L4S team recently
reported fixing a bug in their implementation that might change this
conclusion, and you probably should be aware of it if that's part of
the driver here.  Specifically the alpha was set to 1 instead of 0.
https://l4s.cablelabs.com/

Changing this to avoid some problematic behavior also causes a  more
gradual throughput ramp instead, so you might want to re-test your
conclusions about how fast it can converge on the fluctuating capacity
after that bug-fix is applied.

The charts show some example differences on startup throughput (along
with the problematic RTT response that was fixed by this).

With the fix:
https://l4s.cablelabs.com/l4s-testing/key_plots/batch-l4s-s6-1-prague-50Mbit-80ms_var.png

Without the fix:
https://l4s.cablelabs.com/l4s-testing/key_plots/batch-l4s-s6-prague_alpha-prague-50Mbit-80ms-alpha0_var.png

Cheers and HTH,
Jake

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