Re: [Dart] Gen-art LC review: draft-ietf-dart-dscp-rtp-07
Robert Sparks <rjsparks@nostrum.com> Tue, 14 October 2014 18:47 UTC
Return-Path: <rjsparks@nostrum.com>
X-Original-To: dart@ietfa.amsl.com
Delivered-To: dart@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 417641ACCE1; Tue, 14 Oct 2014 11:47:05 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.354
X-Spam-Level:
X-Spam-Status: No, score=-2.354 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, IP_NOT_FRIENDLY=0.334, RP_MATCHES_RCVD=-0.786, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham
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 MqR1x7G89sn9; Tue, 14 Oct 2014 11:47:03 -0700 (PDT)
Received: from nostrum.com (raven.nostrum.com [69.55.229.100]) (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 224331ACDBC; Tue, 14 Oct 2014 11:47:03 -0700 (PDT)
Received: from unnumerable.local ([173.64.248.98]) (authenticated bits=0) by nostrum.com (8.14.9/8.14.7) with ESMTP id s9EIkw6S061032 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=OK); Tue, 14 Oct 2014 13:46:58 -0500 (CDT) (envelope-from rjsparks@nostrum.com)
X-Authentication-Warning: raven.nostrum.com: Host [173.64.248.98] claimed to be unnumerable.local
Message-ID: <543D6F9C.40201@nostrum.com>
Date: Tue, 14 Oct 2014 13:46:52 -0500
From: Robert Sparks <rjsparks@nostrum.com>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:31.0) Gecko/20100101 Thunderbird/31.1.2
MIME-Version: 1.0
To: "Black, David" <david.black@emc.com>, General Area Review Team <gen-art@ietf.org>, "draft-ietf-dart-dscp-rtp.all@tools.ietf.org" <draft-ietf-dart-dscp-rtp.all@tools.ietf.org>, "ietf@ietf.org" <ietf@ietf.org>, "dart@ietf.org" <dart@ietf.org>
References: <543D463F.4080403@nostrum.com> <CE03DB3D7B45C245BCA0D2432779493605842E@MX104CL02.corp.emc.com>
In-Reply-To: <CE03DB3D7B45C245BCA0D2432779493605842E@MX104CL02.corp.emc.com>
Content-Type: text/plain; charset="utf-8"; format="flowed"
Content-Transfer-Encoding: 7bit
Archived-At: http://mailarchive.ietf.org/arch/msg/dart/rSdl_Ec4waVZ-jFEGyP_GhKf63Q
Subject: Re: [Dart] Gen-art LC review: draft-ietf-dart-dscp-rtp-07
X-BeenThere: dart@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: "\"DiffServ Applied to RTP Transports discussion list\"" <dart.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/dart>, <mailto:dart-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/dart/>
List-Post: <mailto:dart@ietf.org>
List-Help: <mailto:dart-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/dart>, <mailto:dart-request@ietf.org?subject=subscribe>
X-List-Received-Date: Tue, 14 Oct 2014 18:47:05 -0000
On 10/14/14 1:18 PM, Black, David wrote: > Robert, > > Thanks for the review. > >> At the end of page 13, the sentence that starts "Transport protocol >> support for multiple"... is very long and hard to parse. I suspect it >> will be hard to translate. The action of changing the existing protocols >> is implied rather than explicit in the current wording. "current >> designs" is vague. I suggest this as a starting point: "Adding support >> for multiple QoS-based traffic classes within a single network 5-tuple >> to a transport protocol adds significant complexity compared to the >> current protocol definitions. For congestion-controlled transport >> protocols, network congestion information for each QoS-based traffic >> class would have to be disambiguated to allow congestion control to be >> managed separately for each such traffic class." Hopefully it can be >> made even simpler. > Indeed, that sentence is problematic. I've edited the entire paragraph for > clarity. Here's the new text: > > When PHBs that enable reordering are mixed within a single network 5-tuple, > the effect is to mix QoS-based traffic classes within the scope of a single > transport protocol connection or association. As these QoS-based traffic > classes receive different network QoS treatments, they use different pools > of network resources and hence may exhibit different levels of congestion. > The result for congestion-controlled protocols is that a separate instance > of congestion control functionality is needed per QoS-based > traffic class. Current transport protocols support only a single instance > of congestion control functionality for an entire connection or association; > extending that support to multiple instances would add significant protocol > complexity. Traffic in different QoS-based classes may use different paths > through the network; this complicates path integrity checking in connection- > or association-based protocols, as those paths may fail independently. That's great. Thanks! > >> In the first paragraph of 5.2, would "Such reordering may lead to >> unneeded retransmission, and spurious emission of retransmission control >> signals (such as NACK) in reliable delivery protocols (see Section 5.1)" >> work? > Yes, and I've removed "emission of" from that proposed text. Ack > > Thanks, > --David > > >> -----Original Message----- >> From: Robert Sparks [mailto:rjsparks@nostrum.com] >> Sent: Tuesday, October 14, 2014 11:50 AM >> To: General Area Review Team; draft-ietf-dart-dscp-rtp.all@tools.ietf.org; >> ietf@ietf.org; dart@ietf.org >> Subject: Gen-art LC review: draft-ietf-dart-dscp-rtp-07 >> >> I am the assigned Gen-ART reviewer for this draft. For background on >> Gen-ART, please see the FAQ at >> >> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>. >> >> Please resolve these comments along with any other Last Call comments >> you may receive. >> >> Document: draft-ietf-dart-dscp-rtp-07 >> Reviewer: Robert Sparks >> Review Date: 14-Oct-2014 >> IETF LC End Date: 14-Oct-2014 >> IESG Telechat date: not yet scheduled for a telechat >> >> Summary: Ready with nits >> >> These are very small nits to consider. Please feel free to leave the >> existing text alone if these suggestions don't help. >> >> At the end of page 13, the sentence that starts "Transport protocol >> support for multiple"... is very long and hard to parse. I suspect it >> will be hard to translate. The action of changing the existing protocols >> is implied rather than explicit in the current wording. "current >> designs" is vague. I suggest this as a starting point: "Adding support >> for multiple QoS-based traffic classes within a single network 5-tuple >> to a transport protocol adds significant complexity compared to the >> current protocol definitions. For congestion-controlled transport >> protocols, network congestion information for each QoS-based traffic >> class would have to be disambiguated to allow congestion control to be >> managed separately for each such traffic class." Hopefully it can be >> made even simpler. >> >> In the first paragraph of 5.2, would "Such reordering may lead to >> unneeded retransmission, and spurious emission of retransmission control >> signals (such as NACK) in reliable delivery protocols (see Section 5.1)" >> work? >> >>
- [Dart] Gen-art LC review: draft-ietf-dart-dscp-rt… Robert Sparks
- Re: [Dart] Gen-art LC review: draft-ietf-dart-dsc… Black, David
- Re: [Dart] Gen-art LC review: draft-ietf-dart-dsc… Robert Sparks
- Re: [Dart] Gen-art LC review: draft-ietf-dart-dsc… Jari Arkko