Re: [httpstreaming] [AVT] Fw: Agenda and Slides

Wenbo Zhu <wenboz@google.com> Mon, 08 November 2010 09:17 UTC

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References: <249792B19B4845578D9BDC3F77C12D68@china.huawei.com> <58D167AC-E817-4256-88D0-42E36492C562@niven-jenkins.co.uk> <04CAD96D4C5A3D48B1919248A8FE0D540D9B4260@xmb-sjc-215.amer.cisco.com> <3151D5E6-E534-4C1D-978E-7F214B31DFB2@niven-jenkins.co.uk> <068E7ECD-1435-402A-BC1E-3ADCBF023BC7@csperkins.org> <04CAD96D4C5A3D48B1919248A8FE0D540D9B4262@xmb-sjc-215.amer.cisco.com>
Date: Mon, 8 Nov 2010 17:17:34 +0800
Message-ID: <AANLkTik+Q8zibcghgjKuOhHnOeK0Cy_MD4_4vTzEghC6@mail.gmail.com>
From: Wenbo Zhu <wenboz@google.com>
To: "Ali C. Begen (abegen)" <abegen@cisco.com>
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Cc: httpstreaming@ietf.org, Colin Perkins <csp@csperkins.org>
Subject: Re: [httpstreaming] [AVT] Fw: Agenda and Slides
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On Mon, Nov 8, 2010 at 12:43 AM, Ali C. Begen (abegen) <abegen@cisco.com>wrote;wrote:

>
>
> > -----Original Message-----
> > From: Colin Perkins [mailto:csp@csperkins.org]
> > Sent: Monday, November 08, 2010 12:36 AM
> > To: Ben Niven-Jenkins
> > Cc: Ali C. Begen (abegen); httpstreaming@ietf.org
> > Subject: Re: [httpstreaming] [AVT] Fw: Agenda and Slides
> >
> > On 8 Nov 2010, at 00:15, Ben Niven-Jenkins wrote:
> > > On 7 Nov 2010, at 16:04, Ali C. Begen (abegen) wrote:
> > ...
> > >>> From: avt-bounces@ietf.org [mailto:avt-bounces@ietf.org] On Behalf
> Of Ben Niven-Jenkins
> > >>> Colleagues,
> > >>>
> > >>> Reading the slides I'd like to make some comments in advance of the
> bar-bof, we can discuss them more via the mailing
> > list
> > >>> or in the bar-BoF itself.
> > >>>
> > >>> HTTP_Stream_1.ppt Slide 14:
> > >>>
> > >>> "
> > >>> No distinction regular HTTP traffic from HTTP Streaming traffic
> > >>> Disadvantage:
> > >>>  Transport streaming media in the same way as web page
> > >>>  transport Streaming media has no priority to be delivered/processed
> first
> > >>> "
> > >>>
> > >>> This is not correct, it is possible to apply different treatment to
> HTTP Streaming traffic Vs "regular" web page traffic, e.g.
> > by
> > >>> the server setting different TOS/DSCP for streaming Vs "web" traffic.
> > >>
> > >> If the network will not respect to these code points (which is the
> case in the open Internet), this won’t help but the servers
> > themselves can prioritize anything they want to in their scheduling or
> processing. But, I am having difficulty in understanding
> > why this is relevant to a standardization work. It looks to me as a
> product feature differentiation.
> > >
> > > Agreed. IMO this is purely a deployment/implementation issue and not
> something that needs any standardisation.
> >
> > It *might* make sense if the aim were to add an HTTP header to mark HTTP
> streaming requests, so that a web proxy treated
> > them differently? (i.e., differentiation at the HTTP service layer, not
> at the network layer).
>
> Sure, but that does require changes in the proxies. And if we start going
> down that path, there are many, probably better, things that we can do.
>
Isn't this one of biggest advantages of using HTTP, i.e. services are
allowed to define/advise special semantics at the protocol-level without
breaking the transport-level compatibility.  I am glad that DPI was even
mentioned.

- Wenbo


> -acbegen
>
> > Colin
>
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