Re: [alto] Pitfalls for ISP-friendly P2P Design

[Ping Pan <[e-mail]>]

Interesting. I agree that P2P traffic management differs among ISP's. Some
broadband operators may care much about the link cost, while the transit
providers have no such issue as long as the traffic is somewhat symmetrical.
But, I don't think P4P/ALTO is limited to solve the inter-domain traffic
issues only.

I find the following interesting: "...One might expect the median ratio of
average download rate to be 1; i.e., for each peer in a swarm, some nearby
peers will be slower, but others will faster. Instead, the median ratio is
0.15. This is because most BitTorrent peers from popular swarms in our
trace come from the United States, while most capacity comes from
comparatively high bandwidth peers in Europe...."

What does this mean? Does it imply that the content is in some remote
locations? No wonder the locality schemes won't work.

I wonder if the similar study can be done in other locations, such as China
and Europe...

Thanks!

- Ping

On Fri, Oct 23, 2009 at 5:23 PM, Salman Abdul Baset <[e-mail]>wrote:

> A paper in this year's HotNets.
> http://conferences.sigcomm.org/hotnets/2009/papers/hotnets2009-final115.pdf
>
> The paper argues that in practice the benefits of such design may be
> limited due to:
> (1) conflicting interests of ISP.
>  -What is good for one ISP is not always good for the other ISP.
> (2) locality aware traffic may not work for long-tail content.
>
> I am curious what folks on this list have to say about this paper.
>
> Thanks
> Salman
>
>
> On Thu, 22 Oct 2009, [e-mail] wrote:
>
>
>> A new Request for Comments is now available in online RFC libraries.
>>
>>
>>       RFC 5693
>>
>>       Title:      Application-Layer Traffic Optimization (ALTO) Problem
>>                   Statement
>>       Author:     J. Seedorf, E. Burger
>>       Status:     Informational
>>       Date:       October 2009
>>       Mailbox:    [e-mail],
>>                   [e-mail]
>>       Pages:      14
>>       Characters: 34234
>>       Updates/Obsoletes/SeeAlso:   None
>>
>>       I-D Tag:    draft-ietf-alto-problem-statement-04.txt
>>
>>       URL:        http://www.rfc-editor.org/rfc/rfc5693.txt
>>
>> Distributed applications -- such as file sharing, real-time
>> communication, and live and on-demand media streaming -- prevalent on
>> the Internet use a significant amount of network resources.  Such
>> applications often transfer large amounts of data through connections
>> established between nodes distributed across the Internet with little
>> knowledge of the underlying network topology.  Some applications are
>> so designed that they choose a random subset of peers from a larger
>> set with which to exchange data.  Absent any topology information
>> guiding such choices, or acting on suboptimal or local information
>> obtained from measurements and statistics, these applications often
>> make less than desirable choices.
>>
>> This document discusses issues related to an information-sharing
>> service that enables applications to perform better-than-random peer
>> selection.  This memo provides information for the Internet community.
>>
>> This document is a product of the Application-Layer Traffic Optimization
>> Working Group of the IETF.
>>
>>
>> INFORMATIONAL: This memo provides information for the Internet community.
>> It does not specify an Internet standard of any kind. Distribution of
>> this memo is unlimited.
>>
>> This announcement is sent to the IETF-Announce and rfc-dist lists.
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>>
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