How to disable disk cache with kernel 2.4.2 ?

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Hi,
i try to disable the disk cache in kernel 2.4.2 with :
echo "0 0 0" > /proc/sys/vm/pagecache
or
echo "0 0 0" > /proc/sys/vm/buffermem
without any success.

Where can i find documentation about the disk cache ?

N. Turro
PS: i'd like to turn-off the disk cache for disk benchmarks.

 
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