scheduling again

hi all,

Although I didn't recieve may answers to my previous
questions abaout scheduling, I'll give it another try.

I have a system 99% idle and launch a while(1); process.
Why does it take more than a minute to reach 90% cpu
usage for that process? I expected it to get it from the very first
second because no other candidates were waiting for the cpu.

thanks for all answers.