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Re: [tcpm] Poll for CUBIC RFC updates

Neal Cardwell <ncardwell@google.com> Fri, 20 November 2020 16:26 UTC

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From: Neal Cardwell <ncardwell@google.com>
Date: Fri, 20 Nov 2020 11:26:25 -0500
Message-ID: <CADVnQynA_8rOi8Gh-8b2KK_ftRdZV1ePMCZy0DJ7xW9f9Fa0yQ@mail.gmail.com>
To: Vidhi Goel <vidhi_goel=40apple.com@dmarc.ietf.org>
Cc: "tcpm@ietf.org Extensions" <tcpm@ietf.org>
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Subject: Re: [tcpm] Poll for CUBIC RFC updates
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On Mon, Nov 16, 2020 at 9:08 PM Vidhi Goel
<vidhi_goel=40apple.com@dmarc.ietf.org> wrote:
>
> Hello,
>
> As Lars mentioned earlier, there are a couple of issues/proposals filed for updating the CUBIC RFC 8312 and are currently under discussion. The GitHub repo is at https://github.com/NTAP/rfc8312bis.
> We would like to gather information on which CUBIC implementations already or would be ready to adopt these changes.
>
> 1. Update K definition (Eq. 2) to account for Fast Convergence
> Issue link https://github.com/NTAP/rfc8312bis/issues/1
> Linux already has this change. Apple's Cubic implementation for both TCP and QUIC already use this.
>
> 2. Congestion window TCP friendly region after W_max
> Issue link https://github.com/NTAP/rfc8312bis/issues/2
> This is a suggestion to improve performance after cwnd > W_max. Apple's Cubic implementation for both TCP and QUIC already use this.
>
> From my experience, these changes would improve Cubic’s performance.
>
> Please let us know if you already or would be ready to implement these changes in your CUBIC’s implementation.

Yuchung and I chatted about (2.) (
https://github.com/NTAP/rfc8312bis/issues/2 ) and we agreed this looks
like a nice and worthwhile fix, which we should be able to integrate
into the Linux TCP CUBIC implementation.

Thanks for this effort!

best,
neal

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