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Re: [TLS] Efficiency of ACKing scheme

Thomas Fossati <Thomas.Fossati@arm.com> Thu, 09 April 2020 11:27 UTC

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From: Thomas Fossati <Thomas.Fossati@arm.com>
To: Hanno Becker <Hanno.Becker@arm.com>, Rob Sayre <sayrer@gmail.com>
CC: "tls@ietf.org" <tls@ietf.org>, Thomas Fossati <Thomas.Fossati@arm.com>
Thread-Topic: [TLS] Efficiency of ACKing scheme
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Date: Thu, 09 Apr 2020 11:27:21 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/cGxVKhsYcFUF2IFNny3AJgmOeJA>
Subject: Re: [TLS] Efficiency of ACKing scheme
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Hey Hanno,

On 08/04/2020, 15:11, "Hanno Becker" <Hanno.Becker@arm.com> wrote:
> As far as I see, tail loss indication involves a timer in both cases:
>
> - As it stands, tail loss recovery is triggered by the ACK resulting
>   from the 'lack of progress' indicator of disruption, described in
>   the second bullet point of draft-ietf-tls-dtls13-37#section-7.1
>   In particular, it only occurs after a 'short' timer triggered on the
>   receiver, where by 'short' I mean that is has smaller threshold than
>   the ordinary retransmission timer from DTLS 1.2, marking the bottom
>   line recovery time we want to improve upon.
>
> - Likewise, there's short timer based recovery in the new proposal,
>   but mirrored: The sender retransmits upon noticing a gap in the
>   ACKs, which too can be detected by a short timer as in the current
>   proposal.

You are right, this wouldn't have worse tail-loss recovery than what is
currently specified.  So, all things considered it looks like a real
improvement compared to dtls13-37.

Could collect the text from this thread in a PR against Section 7?  This
way folks that haven't followed the discussion closely can see how your
proposal looks overall.

cheers, thanks!

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