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[tcpm] Poll for CUBIC RFC updates

Vidhi Goel <vidhi_goel@apple.com> Tue, 17 November 2020 02:08 UTC

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From: Vidhi Goel <vidhi_goel@apple.com>
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Date: Mon, 16 Nov 2020 18:08:05 -0800
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Subject: [tcpm] Poll for CUBIC RFC updates
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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 <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 <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 <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.

Thanks,
Vidhi

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