Stevens.Le_Blond at sophia.inria.fr wrote: > The savings will indeed have something to do with "the number of peers per > AS" but this can be refined. > > To save cross-domain traffic "globally," you need 1) domains to be big > enough so you will have more than one *simultaneous* peer for big torrents > and that 2) the number of big torrents per domain to outweight the number > of small torrents. Even if it's possible to save a lot for big torrents, > that doesn't mean you can save for most torrents, especially because there > are more small torrents than big ones. Fortunately though, big torrents > also generate much more cross-domain traffic than small ones. > > As I said during my talk at the last IRTF session, we have found that the > top 1,000 torrents on the 214,443 torrents that we have crawled generated > about half of the "global" cross-domain traffic. > > Let me know if this answers your question or if you want me to elaborate > more about this topic. You can also refer the Section 6.3 of our paper > [LeBlond] for more info. Well, this is certainly a useful perspective. What we need now is some text to reflect it in section 3.1.2; if you want to propose some, that will be more than welcome. Otherwise we'll figure something out and will reiterate the discussion on the next version of the document. >> How about replacing the above with the following text? >> >> 4. Experiments with real BitTorrent clients run by researchers a INRIA >> [LeBlond] have shown a 40% reduction in cross-domain traffic on a >> global scale, with local peaks up to the 99.5% in exceptionally >> favorable conditions. >> > > That's better but I would add some numbers to make it clear that "global > scale" actually means at the scale of the Internet. "Global" scale could > be interpreted as all torrents (resp. a single torrent) but from the point > of view of a single AS. Something like this: > > 4. Experiments with real BitTorrent clients and real distributions of peers > per AS run by researchers at INRIA [LeBlond] have shown that ASes > with 100 peers or more can save 99.5% of cross-domain traffic > with high values of locality. > > They have also shown that at a global scale, i.e., 214,443 torrents, > 6,1113,224 unique peers, and 9,605 ASes, high locality can save 40% of > global inter-AS traffic , i.e., 4.56 Petabytes (PB) on 11.6 PB. This > result shows that locality would be beneficial at the scale of the > Internet. Perfect, thanks! -- Ciao, Enrico
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