Re: [core] Martin Duke's Discuss on draft-ietf-core-new-block-11: (with DISCUSS and COMMENT)
Martin Duke <martin.h.duke@gmail.com> Mon, 03 May 2021 18:57 UTC
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From: Martin Duke <martin.h.duke@gmail.com>
Date: Mon, 03 May 2021 11:57:12 -0700
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To: mohamed.boucadair@orange.com
Cc: The IESG <iesg@ietf.org>, "draft-ietf-core-new-block@ietf.org" <draft-ietf-core-new-block@ietf.org>, "core-chairs@ietf.org" <core-chairs@ietf.org>, "core@ietf.org" <core@ietf.org>, "marco.tiloca@ri.se" <marco.tiloca@ri.se>
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Subject: Re: [core] Martin Duke's Discuss on draft-ietf-core-new-block-11: (with DISCUSS and COMMENT)
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On Fri, Apr 30, 2021 at 4:48 AM <mohamed.boucadair@orange.com> wrote: > > > > I can't reconcile (4.1) with the last sentence in (7.2). > > [Med] Why? 4.1 can be done with default CoAP setting. The purpose of this > CON request is to determine support of the functionality. We made this > change: > > OLD: > Congestion control for CON requests and responses is specified in > Section 4.7 of [RFC7252]. In order to benefit from faster > transmission rates, NSTART will need to be increased from 1. > However, the other CON congestion control parameters will need to be > tuned to cover this change. This tuning is not specified in this > document given that the applicability scope of the current > specification assumes that all requests and responses using Q-Block1 > and Q-Block2 will be Non-confirmable (Section 3.2). > > NEW: > Congestion control for CON requests and responses is specified in > Section 4.7 of [RFC7252]. In order to benefit from faster > transmission rates, NSTART will need to be increased from 1. > However, the other CON congestion control parameters will need to be > tuned to cover this change. This tuning is not specified in this > document given that the applicability scope of the current > specification assumes that all requests and responses using Q-Block1 > and Q-Block2 will be Non-confirmable (Section 3.2) apart from the > ^^^^^^^^^^^^^^ > initial Q-Block functionality negotiation. > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > Does the functionality negotiation in (4.1) involve something other than sending Q-Block options? If so, then (4.1) ought to clarify that it's what you mean. If it's just a GET or whatever, then the text here is fine, but there needs to be more on congestion control for confirmable messages. > > Moreover, if > > my reading of (4.1) is correct, it's not sufficient to declare > > congestion control guidance out of scope when it's a mandated part of > > the protocol. > > > > > > > - (7.2) If NON_PROBING_WAIT and NON_PARTIAL_TIMEOUT both "have the > > same value as computed for EXCHANGE_LIFETIME", why are they different > > variables? > > [Med] Because they refer to distinct aspects that may be tweaked > separately: the timeout induced by PROBING_RATE and the one to observe for > expired partial bodies. > > Or is that they SHOULD have the same value but might not? > > A normative word would be helpful here. > > [Med] Not sure a change is needed here given the definition of the two > parameters. > But they can't be tweaked separately! The spec states that they are both computed as EXCHANGE_LIFETIME. It does not allow for them to be set separately.
- [core] Martin Duke's Discuss on draft-ietf-core-n… Martin Duke via Datatracker
- Re: [core] Martin Duke's Discuss on draft-ietf-co… mohamed.boucadair
- Re: [core] Martin Duke's Discuss on draft-ietf-co… Martin Duke
- Re: [core] Martin Duke's Discuss on draft-ietf-co… mohamed.boucadair
- Re: [core] Martin Duke's Discuss on draft-ietf-co… Martin Duke
- Re: [core] Martin Duke's Discuss on draft-ietf-co… mohamed.boucadair
- Re: [core] Martin Duke's Discuss on draft-ietf-co… Martin Duke