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Re: [p2pi] Real life torrent statistics

Reinaldo Penno <rpenno@juniper.net> Tue, 19 August 2008 03:07 UTC

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Date: Mon, 18 Aug 2008 20:06:06 -0700
From: Reinaldo Penno <rpenno@juniper.net>
To: Stas Khirman <stas@khirman.com>, p2pi@ietf.org, p4pwg@yahoogroups.com
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Thread-Topic: [p2pi] Real life torrent statistics
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Subject: Re: [p2pi] Real life torrent statistics
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Hello Stas,

It is refreshing to get real life data like this instead of some Linux
distribution or small legal file that has little relevance. I was wondering
what kind of info we can get from your data that shed light on ALTO
discussions. One that caught my attention was that pure localization will
probably adversely affect certain swarms (even huge ones like this), since
you do not have enough peers in certain ASs.  If the connectivity of the
swarm is not good, getting certain pieces might be difficult even if the
ones ³around² you can be downloaded lightening fast.

I wonder what is the distribution of seeders vs. AS.  I¹m thinking certain
ASs might have enough peers but maybe no seeders. This is also a tricky
situation for optimization where the swarm are islands connected by relay
peers.  

It seems a lot of the bw savings ALTO can deliver is probably a cumulative
effect over many torrents and many peers instead of just one.

Thanks,

Reinaldo


On 8/18/08 1:07 AM, "Stas Khirman" <stas@khirman.com> wrote:

> To estimate a feasibility of ALTO/P4P for real life torrents , I collected
> <ip,port> information for peers from one of the most popular ³PirateBay²
> torrents ( almost 20k peers) and maped their IPs to corresponded ASs. Please
> find attached my working notes with some interesting statistics.
>  
> In short ­ for such kind of swarm (20k peers), almost half of peers belong to
> ASs with 100 or more peers, almost 2/3 of peers belong to ASs with 50 or more
> peers. Less then 15% of peers belong to ASs with 10 or less ³neighbors².
>  
> US broadband ISPs (Road Runner, Comcast, AT&T) have about 2-3% of total peers
> each.
>  
> Also, I find it surprising geo distribution of the peers ­ majority were in UK
> , not in US (probably because content is available in US theaters).  Places
> 3-5 taken by Sweden, Poland and Canada (in total ­ more peers then in US).
>  
> Certainly, observed ³heavy² neighboring of peers is a function of swarm size.
> I intend to investigate a few medium/small size swarms to have a multi-point
> picture for any future discussions.
>  
> I would appreciate comments, corrections and additional ideas on data
> collection and analysis.
> 
> 
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> p2pi@ietf.org
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