Re: [tcpm] [EXTERNAL] Re: Seeking WG opinions on ACKing ACKs with good cause (was: Possible error in accurate-ecn)

Jonathan Morton <chromatix99@gmail.com> Tue, 30 March 2021 19:16 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Tue, 30 Mar 2021 22:16:49 +0300
Cc: "vidhi_goel@apple.com" <vidhi_goel@apple.com>, "tcpm@ietf.org" <tcpm@ietf.org>, "nishida@sfc.wide.ad.jp" <nishida@sfc.wide.ad.jp>, "ietf@kuehlewind.net" <ietf@kuehlewind.net>
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To: Praveen Balasubramanian <pravb@microsoft.com>
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Subject: Re: [tcpm] [EXTERNAL] Re: Seeking WG opinions on ACKing ACKs with good cause (was: Possible error in accurate-ecn)
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> On 30 Mar, 2021, at 9:51 pm, Praveen Balasubramanian <pravb@microsoft.com> wrote:
> 
> This is uncharted territory for congestion control. To date ACK packets have not been considered part of bytes in flight in TCP and QUIC. Congestion control itself impeding the feedback loop has consequences.

I'm aware of the tradeoffs.  I'm just saying that Ack Rate Request can make use of this information, among other sources, and choose an appropriate level of feedback that suits the sender's needs and path characteristics.

 - Jonathan Morton