Hi,
I am going through the code for calculating BogoMips on i386 platform. The
code is there in "init/main.c". The main function for this is "calibrate_delay()". If you
go through the code for calibrate_delay(), you can see that it sets loops_per_jiffies
to 4096 at the starting of the first while loop. Based on the processor's speed, it
goes on incrementing [making it double] its value by (loops_per_delay <<= 1)... It
comes out of the first while loop, once there is a difference between new jiffies and
old jiffies. Now the problem starts after this...
At the second while loop you can see that
while ( lps_precision-- && (loopbit >>= 1) ) {...
the aboce condition will fail always, as the starting value for lps_precision is
LPS_PREC which has been defined to 8.
Why is this loop there, if it will never execute ? because loopbit value will never be
< 4096...
TIA.
Sumit Sharma
IBM, Bangalore.
