On the benefits of P2P cache capacity allocation

Peer-to-peer (P2P) systems are responsible for a large fraction of inter-ISP transit traffic in the Internet. Hence, many Internet service providers (ISPs) have deployed P2P caches to decrease their P2P related transit traffic. In our work we consider the problem of allocating the limited upload capacity of a P2P cache between a set of overlay swarms. The goal of cache capacity allocation is to increase the amount of transit traffic that can be saved using the cache. Our preliminary results are based on analytical models and simulations and show that cache capacity allocation is a promising means of improving the efficiency of P2P caches. We are currently validating our results via experiments on Planet-Lab.