P2P locality seems to me a red herring since most major ISPs: * have markets in several countries and geographic areas * lease physical facilities or IP networks from and to other ISPs; a very complex mapping * keep their L2 and L3 network maps and leasing costs very secret for competitive reasons.
Having worked many years for a leading ISP with global reach, I guess locality would have seemed hard to define to our team. Unless the p2p protocol measures the latency, bandwidth and the number of IP hops itself. I have not seen any protocol that can also measure ownership of links by ISPs and numbers of hops between ISPs, their $$$ costs and populate the routing table with such metrics. Please share if you know such a technology. Henry On 12/4/08 6:22 AM, "Stevens Le Blond" <[EMAIL PROTECTED]> wrote: > > > Hello, > > We are glad to advertise our new paper called "Pushing BitTorrent > Locality to the Limit." In this paper, we run controlled torrents with > up to 10,000 peers to evaluate the impact of locality on inter-ISP > links traffic and peers download completion time (See abstract below). > > Stevens Le Blond, Arnaud Legout, Walid Dabbous. > "Pushing BitTorrent Locality to the Limit". > Technical Report (inria-00343822, version 1 - 2 December 2008), INRIA, > Sophia Antipolis, December 2008. > http://hal.inria.fr/inria-00343822/en/ > > Comments are welcomed. > > Best regards, > Stevens Le Blond > > Peer-to-peer locality has recently raised a lot of interest in the > community. Indeed, whereas peer-to-peer content distribution enables > financial saving for the content providers who do not have to maintain > a dedicated infrastructure, it dramatically increases the traffic on > inter-ISP links. > > To solve this issue, the idea to keep a fraction of the peer-to-peer > traffic local to each ISP was introduced a few years ago. Since then, > peer-to-peer solutions exploiting locality have been > introduced. However, several fundamental issues on locality still need > to be explored. For instance, how far can we push locality for a > peer-to-peer distribution without impacting its robustness? > > In this paper, we perform extensive experiments on a controlled > environment with up to 10,000 peers to evaluate the impact of locality > on inter-ISP links traffic and peers download completion time. In > particular, we show that high locality values enable up to two orders > of magnitude saving on inter-ISP links without any significant impact > on peers download completion time. > > > > _______________________________________________ > p2p-hackers mailing list > p2p-hackers@lists.zooko.com > http://lists.zooko.com/mailman/listinfo/p2p-hackers >
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