[squid-users] filesystem performance

I try to figure out which filesystem is best for Squid's cache. Until now,
it looks like ReiserFS is the winner (but i don't have yet any numbers).
While reading the docs, i've found these lines in ReiserFS's FAQ:

##########################################################
Once a disk drive gets more than 85% full, the performance starts to
suffer unless using a repacker (which isn't implemented yet.) You can
probably get away with 92%, but if performance is valued you are making a
mistake to keep it any fuller. This is true for almost all file systems.
ReiserFS does better than others because, due to our packing tails
together, for the same amount of data we are a lower percentage of full.
##########################################################

My question is: does anyone have some benchmarks proving any performance
degradation when the cache drives are filled over 85%? (it doesn't matter
on which FS you're doing the tests)

-- 
Florin Andrei