BitTorrent or BitCrunch: Evidence of a credit squeeze in BitTorrent?

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Authors

David Hales, Rameez Rahman, Boxun Zhang, Michel Meulpolder and Johan Pouwelse

Abstract

BitTorrent is a highly popular peer-to-peer file-sharing protocol. Much BitTorrent activity takes place within private virtual communities called Private Trackers- a server that allows only community members to share files. Many private trackers implement ratio enforcement where the tracker monitors the upload and download behaviour of peers. If a peer downloads substantially more than it uploads then service is terminated. Tracker policies related to credit effect the performance of the community as a whole. We identify the possibility of a credit squeeze in which performance is reduced due to lack of credit for some peers. We consider statistics from a popular private tracker and results from a simple model (called BitCrunch).


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