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Caching for BitTorrent-Like P2P Systems: A Simple Fluid Model and Its Implications
KTH, School of Electrical Engineering (EES), Communication Networks. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0002-4876-0223
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2012 (English)In: IEEE/ACM Transactions on Networking, ISSN 1063-6692, E-ISSN 1558-2566, Vol. 20, no 4, 1176-1189 p.Article in journal (Refereed) Published
Abstract [en]

Peer-to-peer file-sharing systems are responsible for a significant share of the traffic between Internet service providers (ISPs) in the Internet. In order to decrease their peer-to-peer-related transit traffic costs, many ISPs have deployed caches for peer-to-peer traffic in recent years. We consider how the different types of peer-to-peer caches-caches already available on the market and caches expected to become available in the future-can possibly affect the amount of inter-ISP traffic. We develop a fluid model that captures the effects of the caches on the system dynamics of peer-to-peer networks and show that caches can have adverse effects on the system dynamics depending on the system parameters. We combine the fluid model with a simple model of inter-ISP traffic and show that the impact of caches cannot be accurately assessed without considering the effects of the caches on the system dynamics. We identify scenarios when caching actually leads to increased transit traffic. Motivated by our findings, we propose a proximity-aware peer-selection mechanism that avoids the increase of the transit traffic and improves the cache efficiency. We support the analytical results by extensive simulations and experiments with real BitTorrent clients.

Place, publisher, year, edition, pages
IEEE , 2012. Vol. 20, no 4, 1176-1189 p.
Keyword [en]
Caching, fluid model, peer-to-peer (P2P)
National Category
Telecommunications Computer Science
URN: urn:nbn:se:kth:diva-103161DOI: 10.1109/TNET.2011.2175246ISI: 000307895100015ScopusID: 2-s2.0-84865316168OAI: diva2:559619
EU, FP7, Seventh Framework ProgrammeICT - The Next Generation

QC 20121010

Available from: 2012-10-10 Created: 2012-10-04 Last updated: 2016-04-25Bibliographically approved

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Dán, György
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Communication NetworksACCESS Linnaeus Centre
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