speed based replacement instead of LRU based

With the new high-bandwidth access methods like ADSL, and the fact that
bandwidth is getting cheaper a lot faster than big servers with lots
of disk space, using a proxy cache doesn't necessarily save bandwidth
anymore. With lots of high-speed users a small 100 GB cache won't
have the chance to cache much - objects will be replaced too fast.

Now, I see one other very good reason for using a cache: to minimize
latency. So it would be a good idea if LRU replacement could be changed
into FD replacement: Fastest Download. Objects that took a lot of
time to download stay longer in the cache than nearby objects that
can be downloaded at max speed anyway. A combination of the two
would be best, ofcourse.

Has anyone ever done some work on this? It can't be a novel idea.

Mike.

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