ARE FILE SWAPPING NETWORKS CACHEABLE? CHARACTERIZING P2P TRAFFIC (PDF):
Our analysis of the traffic computed a 67%
byte-hit-rate which compares favorably with web caching
hit rates known to be in the range of 30% to 60%. Further, it
was shown that the disk space required for effective caching
of P2P traffic is small enough to be practical – close to
maximal caching is attained with 200 GB disk space.
Finally our analysis concludes that the byte-hit-rate
computed at our installation correlated with the traffic
volume, indicating that a higher byte-hit-rate may be
expected on links with a heavier traffic load.