kernel profiling

[Yours Lovingly]

hello, 
i m trying to use kernel profiling to study nfs client
cache performance in 2.4.18.
But unfortunately :
i turned on profiling on the kernel command line with
profile=2
but whenever i give a readprofile command, all i get
is a single line that goes like:
     0 total                 0.0000

1. please suggest a way to make readprofile work.
2. please suggest someother profiling mechanism that
could be of more help

thanks a lot

abhishek

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