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Re: [tsvwg] A review of draft-ietf-tsvwg-l4s-arch-09

Neal Cardwell <ncardwell@google.com> Tue, 22 June 2021 20:34 UTC

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From: Neal Cardwell <ncardwell@google.com>
Date: Tue, 22 Jun 2021 16:33:45 -0400
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To: Vidhi Goel <vidhi_goel=40apple.com@dmarc.ietf.org>
Cc: tsvwg IETF list <tsvwg@ietf.org>, Bob Briscoe <ietf@bobbriscoe.net>
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Subject: Re: [tsvwg] A review of draft-ietf-tsvwg-l4s-arch-09
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On Tue, Jun 22, 2021 at 12:03 AM Vidhi Goel <vidhi_goel=
40apple.com@dmarc.ietf.org> wrote:

>
> 3. Section 4, Hosts
>     >> Also the L4S ECN part of
>
>     BBRv2 [I-D.cardwell-iccrg-bbr-congestion-control <https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-l4s-arch-09#ref-I-D.cardwell-iccrg-bbr-congestion-control>] is a scalable
>     congestion control intended for the TCP and QUIC transports,
>     amongst others.
>
>
> The BBR draft has no mention of L4S ECN so far. Are we expecting an
> updated BBR draft and reference? There is another reference in Section 5.2.
>
>
If it's desired to have references for BBRv2 that cover the topic of ECN,
in order to avoid having dependencies on future BBR draft updates, it may
make sense to reference already-existing documentation about BBRv2. Some
possible options:

(1) BBRv2 algorithm high-level overview:

https://datatracker.ietf.org/meeting/104/materials/slides-104-iccrg-an-update-on-bbr-00

(2) the BBRv2 alpha release for Linux TCP:
  https://github.com/google/bbr/blob/v2alpha/README.md

(3) code from the BBRv2 alpha release for Linux TCP:
  https://github.com/google/bbr/blob/v2alpha/net/ipv4/tcp_bbr2.c

Thanks,
neal

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