examine L1 instruction cache

Greetings!

I has been encouraged by some people to measure the effect of L1 instruction cache.
(is known to be of 32kb on core2duo machine).
Methodology which I chose:

1) generate 100kb of uniform code, like

start:
jmp ebx (ebx = $ + 100kb - codesize)
...
dec eax
dec eax
dec eax (this instruction is known to have 1 byte machine code)
...
cmp eax, 0
jge start

2) Place 2*10^9 to eax
3) Calculate jump address to place in ebx, so the amount of code executed is f.e. 10kb
4) Execute:)