Over used cache memory?

[Wee Teck Neo]

My system having 1GB ram and this is the output of vmstat

  procs                      memory      swap          io     system      
cpu
r  b  w   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy 
id
0  0  0   5640  21224 121512 797832    0    0     6     9    3    17  0  0  
6


It seems that 797MB is used for caching... thats a high number. Anyway to 
set a lower cache size?

I've read about the /proc/sys/vm/buffermem but my /proc doesn't have it.

Kernel: 2.4.22

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