Re: [AVTCORE] Éric Vyncke's No Objection on draft-ietf-avtcore-cc-feedback-message-08: (with COMMENT)

Colin Perkins <csp@csperkins.org> Mon, 02 November 2020 13:38 UTC

Return-Path: <csp@csperkins.org>
X-Original-To: avt@ietfa.amsl.com
Delivered-To: avt@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DB6343A00D2; Mon, 2 Nov 2020 05:38:30 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.1
X-Spam-Level:
X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=csperkins.org
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id FjRW8IKHR7qW; Mon, 2 Nov 2020 05:38:29 -0800 (PST)
Received: from haggis.mythic-beasts.com (haggis.mythic-beasts.com [IPv6:2a00:1098:0:86:1000:0:2:1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D606A3A0D96; Mon, 2 Nov 2020 05:38:28 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=csperkins.org; s=mythic-beasts-k1; h=To:Date:From:Subject; bh=BvdUc5U5a2vZ7TCZHHYU0Z6L9V+PKjJPWMDBRqbHvO8=; b=BH9FDw0tjb/53AlXRep/3coU6F yQsGFNWy3dCUfDOSTOcOR4pnGrndxZ6zHd0yaRrKLUBLhdcCQtTGmL3nzXnVVa632FAspvp4dP7Bt 0UIaCYyfY6t4QSscMv+w/u3H7pqZ3mSt3uQWbdMJfO6DJg88M+jyZZSUr2NQcQQ2M0GDO7kxhGcBc 8DX4pWdq2CHGqYFuj6HGyOs4TGkIaXxE/0z6RBuNvXWyQw7KM1tD5Az/tRZ4Q/IVgQUp6WoMrzvCe HPZNQmh3XHiMWPZCHDcqbtxP9oITtfKkSL5y5P8Ne+JGLyz6MRGRfTwLbjwM3xoZaI0f1Xkzv8eD4 cAmJBe+Q==;
Received: from [81.187.2.149] (port=49046 helo=[192.168.0.67]) by haggis.mythic-beasts.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92.3) (envelope-from <csp@csperkins.org>) id 1kZa2V-00036E-9V; Mon, 02 Nov 2020 13:38:27 +0000
Content-Type: text/plain; charset=utf-8
Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.17\))
From: Colin Perkins <csp@csperkins.org>
In-Reply-To: <160076061909.10978.10005825889375833839@ietfa.amsl.com>
Date: Mon, 2 Nov 2020 13:38:21 +0000
Cc: The IESG <iesg@ietf.org>, avtcore-chairs@ietf.org, avt@ietf.org, draft-ietf-avtcore-cc-feedback-message@ietf.org
Content-Transfer-Encoding: quoted-printable
Message-Id: <451153E1-7712-41FD-BDE0-A788979ECAB5@csperkins.org>
References: <160076061909.10978.10005825889375833839@ietfa.amsl.com>
To: =?utf-8?Q?=C3=89ric_Vyncke?= <evyncke@cisco.com>
X-Mailer: Apple Mail (2.3445.104.17)
X-BlackCat-Spam-Score: 4
Archived-At: <https://mailarchive.ietf.org/arch/msg/avt/VdriNriXVgQKMFwb1C2lfxIIpZQ>
Subject: Re: [AVTCORE] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-i?= =?utf-8?q?etf-avtcore-cc-feedback-message-08=3A_=28with_COMMENT=29?=
X-BeenThere: avt@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Audio/Video Transport Core Maintenance <avt.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/avt>, <mailto:avt-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/avt/>
List-Post: <mailto:avt@ietf.org>
List-Help: <mailto:avt-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/avt>, <mailto:avt-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 02 Nov 2020 13:38:31 -0000

> On 22 Sep 2020, at 08:43, Éric Vyncke via Datatracker <noreply@ietf.org> wrote:
> 
> Éric Vyncke has entered the following ballot position for
> draft-ietf-avtcore-cc-feedback-message-08: No Objection
> 
> When responding, please keep the subject line intact and reply to all
> email addresses included in the To and CC lines. (Feel free to cut this
> introductory paragraph, however.)
> 
> 
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://datatracker.ietf.org/doc/draft-ietf-avtcore-cc-feedback-message/
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Thank you for the work put into this document.
> 
> Please find below a couple of non-blocking COMMENT points and nits.
> 
> I hope that this helps to improve the document,
> 
> Regards,
> 
> -éric
> 
> == COMMENTS ==
> 
> -- Section 3.1 --
> In "but overlapping reports MAY be sent (and need to be sent in cases" should
> the "need" be a "MUST” ?

Overlapping need to be sent to retrospectively correct the loss reports when reordering occurs across the boundary between reports. Aside from a (slightly) incorrect loss rate estimate nothing will break if the overlapping report isn’t sent. As such, I think “MUST” is too strong.

> -- Section 5 --
> In "then the sender SHOULD rapidly reduce", "sender" is somehow ambiguous: is
> it the feedback transmitter or the media source sender ?

Media sender. Will fix.

> -- Section 6 --
> The mandatory use of "*" appears strange to the non-SDP expert (like myself).
> Why transmitting something that is always identical? What is the value ?

RFC 4585 requires this syntax to indicate the feedback applies to all payload types used in the session.

> == NITS ==
> -- Section 3.1 --
> As some reader may also wonder like me, why the use of 'L' (at least I am
> puzzled)? why not giving one word mnemonic to explain the logic behind this
> choice ?

Renamed to R (Received)

> -- Section 7 --
> Is there a typo in ""a=ecn-capaable-rtp:"” ?

Fixed.

> it is probably redundant to again expand ECN.
> 
> 
> 
> _______________________________________________
> Audio/Video Transport Core Maintenance
> avt@ietf.org
> https://www.ietf.org/mailman/listinfo/avt



-- 
Colin Perkins
https://csperkins.org/