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[EToSat] FW: picoquic ACK Tuning

"Border, John" <John.Border@hughes.com> Tue, 13 December 2022 21:57 UTC

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From: "Border, John" <John.Border@hughes.com>
To: "EToSat@ietf.org" <etosat@ietf.org>
Thread-Topic: picoquic ACK Tuning
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Date: Tue, 13 Dec 2022 21:57:25 +0000
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Subject: [EToSat] FW: picoquic ACK Tuning
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-----Original Message-----
From: Christian Huitema <huitema@huitema.net> 
Sent: Tuesday, December 13, 2022 11:29 AM
To: Border, John <John.Border@hughes.com>
Subject: Re: picoquic ACK Tuning

**EXTERNAL EMAIL** 



On 12/13/2022 8:17 AM, Border, John wrote:
> 
> Christian,
> 
>      You did a lot of ACK rate tuning work in picoquic as part of getting good performance results  over GEO.  Is this captured in an I-D somewhere or do I need to just  look at the code?

I don't think I wrote it down, except maybe in emails. I could certainly write a blog. The basic algorithm is expressed in the ACK rate computation in the code, which feeds in the standard "delayed ACK" logic of QUIC. But that code contains a few magic numbers, and these are worth an explanation.

The most complicated part happens when doing that with multipath, and allowing acks to be sent on a variety of path. It is more efficient overall, but brings in a lot of complexity. You don't need it in most setups.

-- Christian Huitema

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