The price of anarchy is independent of the network topology
STOC '02 Proceedings of the thiry-fourth annual ACM symposium on Theory of computing
Proceedings of the twenty-second annual symposium on Principles of distributed computing
Modeling and performance analysis of BitTorrent-like peer-to-peer networks
Proceedings of the 2004 conference on Applications, technologies, architectures, and protocols for computer communications
The price of selfish behavior in bilateral network formation
Proceedings of the twenty-fourth annual ACM symposium on Principles of distributed computing
Bittorrent is an auction: analyzing and improving bittorrent's incentives
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Assortative mixing in BitTorrent-like networks
INFOCOM'09 Proceedings of the 28th IEEE international conference on Computer Communications Workshops
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The Tit-for-Tat strategy implemented in BitTorrent (BT) clients is generally considered robust to selfish behaviours. The authors of [1] support this belief studying how Tit-for-Tat can affect selfish peers who are able to set their upload bandwidth. They show that there is a "good" Nash Equilibrium at which each peer uploads at the maximum rate. In this paper we consider a different game where BT clients can change the number of connections to open in order to improve their performance. We study this game using the analytical framework of network formation games [2]. In particular we characterize the set of pairwise stable networks the peers can form and how the peers can dynamically reach such configurations.We also evaluate the loss of efficiency peers experience because of their lack of coordination: we find that the loss of efficiency is in general unbounded despite the utilization of the Tit-for-Tat strategy.