Pushing BitTorrent Locality to the Limit

Stevens Le Blond (1) , Arnaud Legout (1) , Walid Dabbous (1)

1 PLANETE - Protocols and applications for the Internet

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.

Mots clés: BitTorrent; locality; inter-ISP traffic

Domaines: Réseaux et télécommunications [cs.NI]

Stevens Le Blond, Arnaud Legout, Walid Dabbous. Pushing BitTorrent Locality to the Limit. 2008. ⟨inria-00343822v1⟩