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Re: Call For Adoption QUIC: delayed-ack

Mirja Kuehlewind <mirja.kuehlewind@ericsson.com> Wed, 07 April 2021 13:55 UTC

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From: Mirja Kuehlewind <mirja.kuehlewind@ericsson.com>
To: Matt Joras <matt.joras@gmail.com>, IETF QUIC WG <quic@ietf.org>
Subject: Re: Call For Adoption QUIC: delayed-ack
Thread-Topic: Call For Adoption QUIC: delayed-ack
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Date: Wed, 07 Apr 2021 13:55:40 +0000
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Hi,

I know I'm too late but I also support adoption.

But now that I found the time to read the draft again, I also have two comment:

1) It seems like min_ack_delay is "only" used for negotiation because the draft does not specify any further what to do with this value. Isn't either min_ack_delay or Packet Tolerance sufficient, e.g. what if you have a packet tolerance of 1 but a min_ack_delay of > 0?

2) For ECN, you don't need to send an immediate ACK for each CE. Immediate ACKs are most important when the codepoint switches to CE, but then, if multiple CEs in a row are received, you can bundle the ACK information. See also https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-14#section-3.2.2.5.1 
(Note that we are still working on that section for AccECN but I think any changes are only relevant for specifics of TCP)

Mirja



On 30.03.21, 21:39, "QUIC on behalf of Matt Joras" <quic-bounces@ietf.org on behalf of matt.joras@gmail.com> wrote:

    Hello all,

    Now that we have been rechartered we can move forward with adopting
    new items. It is the opinion of the chairs that the delayed-ack
    draft[1] has sufficient interest from and relevance to the WG to be
    formally adopted. This email is the call to do so. There are already
    several interoperating implementations of the current draft. Please
    reply to this email with any comments, the call will run through April
    6th.

    Thanks,
    QUIC Chairs

    [1] https://datatracker.ietf.org/doc/draft-iyengar-quic-delayed-ack/

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