A P2P Cache Capacity Design Method to Minimize the Total Traffic Cost of Access ISPs
Zhai Hai-bi · Dianzi xuebao · 2015
By deploying Peer-to-Peer( P2P) caches at the edge of access ISPs,cross-ISP P2 P traffic can be reduced.The problem is how to design an optimal cache capacity? Up to now,no optimal P2 P cache capacity design method has been proposed yet. In this paper,an optimal P2 P cache capacity design method is proposed based on the storage versus bandwidth cost tradeoff. In order to minimize the total traffic cost of access ISPs,the cache capacity design problem is formulated into an integer programming problem whose objective function is piecewise continuous. The formula of optimal cache capacity can be derived through theoretical derivation. Experimental results suggest that compared with several simple design rules including No Cache,Median and20-80 Rule,ISPs can achieve significant cost saving using our method. For example,compared with 20-80 Rule that is most commonly used by ISPs nowadays,the cost saving can be as much as 7. 5%.