profiling kernel routing code. how to do it?

Hello everyone,
I want to profile some code in the kernel. Specifically, I wish to
see the amount of time spent by the kernel in route.c (since I am
testing the routing performance of the kernel). I am using the 2.6
series.
I tried to use oprofile but I am not sure how to get it to work. I
get numbers in opreport for the kernel modules and the various
libraries but nothing more specific. Can someone point me to the
correct instuctions?


Thank You.
Azeem Khan
Bombay, India.