Re: [httpstreaming] [conex] [dispatch] Q-HTTP
Roland Bless <roland.bless@kit.edu> Wed, 10 November 2010 08:11 UTC
Return-Path: <roland.bless@kit.edu>
X-Original-To: httpstreaming@core3.amsl.com
Delivered-To: httpstreaming@core3.amsl.com
Received: from localhost (localhost [127.0.0.1]) by core3.amsl.com (Postfix) with ESMTP id BA53C3A6A28; Wed, 10 Nov 2010 00:11:29 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.249
X-Spam-Level:
X-Spam-Status: No, score=-6.249 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, HELO_EQ_DE=0.35, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([64.170.98.32]) by localhost (core3.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gVIsrtCTnOgy; Wed, 10 Nov 2010 00:11:26 -0800 (PST)
Received: from iramx2.ira.uni-karlsruhe.de (iramx2.ira.uni-karlsruhe.de [141.3.10.81]) by core3.amsl.com (Postfix) with ESMTP id A8B133A6A17; Wed, 10 Nov 2010 00:11:25 -0800 (PST)
Received: from irams1.ira.uni-karlsruhe.de ([141.3.10.5]) by iramx2.ira.uni-karlsruhe.de with esmtps port 25 id 1PG5mF-0000yX-E6; Wed, 10 Nov 2010 09:11:37 +0100
Received: from i72ms.tm.uni-karlsruhe.de ([141.3.70.5] helo=smtp.ipv6.tm.uni-karlsruhe.de) by irams1.ira.uni-karlsruhe.de with esmtps port 25 id 1PG5mF-0004ta-9w; Wed, 10 Nov 2010 09:11:31 +0100
Received: from vorta.tm.uka.de (i72vorta.tm.uni-karlsruhe.de [IPv6:2001:638:204:6:21b:fcff:fe96:fe02]) by smtp.ipv6.tm.uni-karlsruhe.de (Postfix) with ESMTP id 3D4CD2FC046; Wed, 10 Nov 2010 09:11:31 +0100 (CET)
Received: from [IPv6:::1] (ip6-localhost [IPv6:::1]) by vorta.tm.uka.de (Postfix) with ESMTPS id 1C9D7282; Wed, 10 Nov 2010 09:11:31 +0100 (CET)
Message-ID: <4CDA53B2.9000209@kit.edu>
Date: Wed, 10 Nov 2010 09:11:30 +0100
From: Roland Bless <roland.bless@kit.edu>
Organization: Institute of Telematics, Karlsruhe Institute of Technology
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Thunderbird/3.0.10
MIME-Version: 1.0
To: David Singer <singer@apple.com>
References: <3349FECF788C984BB34176D70A51782F106701E2@FRMRSSXCHMBSB3.dc-m.alcatel-lucent.com> <6750274E2CC345C18EDE9FDDD59F24FA@china.huawei.com> <3349FECF788C984BB34176D70A51782F1067054D@FRMRSSXCHMBSB3.dc-m.alcatel-lucent.com> <DBB1DC060375D147AC43F310AD987DCC180E504600@ESESSCMS0366.eemea.ericsson.se> <3349FECF788C984BB34176D70A51782F168772C1@FRMRSSXCHMBSB3.dc-m.alcatel-lucent.com> <EAA2CFBF-9434-4E52-A586-7AE5F665A9DF@apple.com>
In-Reply-To: <EAA2CFBF-9434-4E52-A586-7AE5F665A9DF@apple.com>
X-Enigmail-Version: 1.0.1
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-ATIS-AV: ClamAV (irams1.ira.uni-karlsruhe.de)
X-ATIS-AV: ClamAV (iramx2.ira.uni-karlsruhe.de)
X-ATIS-AV: Kaspersky (iramx2.ira.uni-karlsruhe.de)
X-ATIS-Timestamp: iramx2.ira.uni-karlsruhe.de 1289376697.411569000
X-Mailman-Approved-At: Tue, 16 Nov 2010 08:29:25 -0800
Cc: dispatch@ietf.org, httpstreaming <httpstreaming@ietf.org>, conex@ietf.org, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>, "GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)" <jose_javier.garcia_aranda@alcatel-lucent.com>
Subject: Re: [httpstreaming] [conex] [dispatch] Q-HTTP
X-BeenThere: httpstreaming@ietf.org
X-Mailman-Version: 2.1.9
Precedence: list
List-Id: Network based HTTP Streaming discussion list <httpstreaming.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/listinfo/httpstreaming>, <mailto:httpstreaming-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/httpstreaming>
List-Post: <mailto:httpstreaming@ietf.org>
List-Help: <mailto:httpstreaming-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/httpstreaming>, <mailto:httpstreaming-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 10 Nov 2010 08:11:29 -0000
Hi David, On 09.11.2010 11:31, David Singer wrote: > It is that there are two ways to solve a real-time bandwidth need. > One is to reserve bandwidth, manage QoS and so on; one gets > protocols and systems like diffserv, ATM, and so on. The other is > simply to have 'too much' of the resource. Though it feels wrong, QoS mechanisms are usually only necessary if you've got some kind of resource shortage. They try to manage the resource scarcity in some way then. So having "too much of a resource" seems to imply that we actually don't need any QoS support. The basic problem is that even if you over-provision you'll depend on the traffic distribution (i.e. the traffic matrix). For instance, if you've got 10x100Mbit/s links aggregated to a 1 Gbit/s "upstream" link, you usually have no problem of transmitting traffic towards the larger link. In the other direction though, it depends heavily on the incoming traffic distribution. So if the 1 Gbit/s link transmits 200 Mbit/s towards a single 100Mbit/s link over a longer period, you'll get dropped packets. Denial-of-Service attacks can achieve this effect intentionally. It's no problem using my PC and trying to flood several DSL subscriber lines, or using 10 PCs at our campus site and trying to flood some link with the aggregated bandwidth of ~ 10 Gbit/s. Your real-time traffic will definitely suffer then... I fear that the bandwidth demand will increase a lot due to HD streaming etc. and that we need some kind of active QoS management at the edge or access networks at least. > the latter often ends up being the cheaper and easier solution. So, Yes, but not a really reliable solution and it works only as long as the fair/whatever resource share is enough to provide the minimum acceptable quality. > The same is true for multimedia delivery; the complexity of RTP + > TCP friendliness + QoS management is not worth it compared to having > adaptable end-systems and overall more bandwidth than needed. I agree that having adaptable applications is a good idea anyway and that QoS management adds a lot of complexity (and also complexity at SLA level). > (I worked on real-time scheduling systems as well, and the same > applies; it's cheaper to have a processor which is much faster than > needed, with a normal scheduler, than to have a just-enough processor > with a real-time scheduler). > I know, it 'feels' wrong. I think it's fine as long as everything behaves somehow friendly, i.e., in the absence of DoS flooding attacks... Regards, Roland
- Re: [httpstreaming] [dispatch] Q-HTTP Qin Wu
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP Mark Nottingham
- Re: [httpstreaming] [dispatch] Q-HTTP Ingemar Johansson S
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [dispatch] Q-HTTP Gunnar Heikkilä
- Re: [httpstreaming] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [dispatch] Q-HTTP Gunnar Heikkilä
- Re: [httpstreaming] [dispatch] Q-HTTP Ingemar Johansson S
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP Ali C. Begen (abegen)
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP Henry Sinnreich
- Re: [httpstreaming] [dispatch] Q-HTTP Lars Eggert
- Re: [httpstreaming] [dispatch] Q-HTTP Kathy McEwen
- Re: [httpstreaming] [dispatch] Q-HTTP Mark Watson
- Re: [httpstreaming] [dispatch] Q-HTTP Ben Niven-Jenkins
- Re: [httpstreaming] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP Ingemar Johansson S
- Re: [httpstreaming] [dispatch] Q-HTTP Dirk Kutscher
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Van Caenegem, Tom (Tom)
- Re: [httpstreaming] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mcdysan, David E
- Re: [httpstreaming] [dispatch] Q-HTTP Kathy McEwen
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP David Singer
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Kathy McEwen
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP ken carlberg
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Roland Bless
- Re: [httpstreaming] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [dispatch] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Toby Moncaster
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Toby Moncaster
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Hadriel Kaplan
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Henry Sinnreich
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Janet P Gunn
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP GARCIA ARANDA, JOSE JAVIER (JOSE JAVIER)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Kevin Mason
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] Q-HTTP Marshall Eubanks
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Ben Niven-Jenkins
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Marshall Eubanks
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Ben Niven-Jenkins
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP David Singer
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP David Singer
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Benjamin Niven-Jenkins
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [dispatch] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Benjamin Niven-Jenkins
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mikael Abrahamsson
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Marshall Eubanks
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Mark Baugher
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Mike Hammer (hmmr)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP Adam Roach
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [dispatch] [conex] Q-HTTP DIAZ VIZCAINO, LUIS MIGUEL (LUIS MIGUEL)
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Woundy, Richard
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Kathy McEwen
- Re: [httpstreaming] [conex] [dispatch] Q-HTTP Marshall Eubanks