Fabrício Benevenuto,  Jose Ismael Junior,  Jussara Almeida. 

This paper provides a performance evaluation of four mechanisms applied in current unstructured P2P systems, quantifying the main benefits of each feature over the previous community-based message flooding protocol. Our main results show that a hierarchical super-peer architecture and a content-aware query routing mechanism are each responsible for significant reductions on system load with no impact on the number of successful queries. Furthermore, user-controlled query retransmission gives users the flexibility to trade higher query success rates and shorter download times for longer latency. Finally, the benefit of downloading a file from multiple sources can be limited if they are not carefully selected.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2005/067.pdf

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