Re: Proposed extension for delayed acknowledgments

Christian Huitema <huitema@huitema.net> Thu, 23 January 2020 23:53 UTC

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Subject: Re: Proposed extension for delayed acknowledgments
To: Matt Joras <matt.joras@gmail.com>, Ian Swett <ianswett=40google.com@dmarc.ietf.org>
Cc: Jana Iyengar <jri.ietf@gmail.com>, QUIC WG <quic@ietf.org>
References: <CACpbDcdaGPZN1MpxE8GRV64dO8OK64xbCoUvxHPmCoCk9R-MOg@mail.gmail.com> <CAKcm_gNWXn_binsbcxkpzB8pFy+tEU7ZJ2CvGSCtnEKHNqN8Jg@mail.gmail.com> <CADdTf+iMwjodXccWkfOTOQe6ahFNPK4bFZ5v5tpk1oqO0f4Pdw@mail.gmail.com>
From: Christian Huitema <huitema@huitema.net>
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Date: Thu, 23 Jan 2020 13:53:34 -1000
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On 1/23/2020 12:25 PM, Matt Joras wrote:

> Thank you Jana and Ian for doing this!
>
> As I noted on #3304, we have also observed this sort of change is
> critical to reducing client-originated ACK traffic for typical
> Internet content, and for CPU performance of both client and server.
> Noting here that I have opened an issue (#17
> <https://github.com/janaiyengar/ack-frequency/issues/17>) for the
> following: given that we have a basic heuristic that seems to work
> pretty well for multiple deployments (default behavior for first 100
> packets, packet tolerance of 10 after), do we want to make that
> recommendation explicit in the extension itself?

+1

Also, I am a bit concerned of the slippery slope there. Suppose a peer
receives a frame that says "only every 22 packets please". Are we going
to flag a protocol violation if the receiver acks after 23 packets? Or
10? Or 1?

-- Christian Huitema