[prev in list] [next in list] [prev in thread] [next in thread] 

List:       linux-kernel
Subject:    Re: BogoMIPS
From:       "Richard B. Johnson" <root () chaos ! analogic ! com>
Date:       1998-09-30 20:56:56
[Download RAW message or body]

On Wed, 30 Sep 1998, John Alvord wrote:

> On Wed, 30 Sep 1998, Richard B. Johnson wrote:
> 
> > 
> > Don't forget the reason for this. The reason was to eliminate getting
> > a different BogoMIPS reading when the kernel is rebuilt.
> > 
> This will reduce the number of questions
> 

For hackers... a piece of test-code that does the same thing without
using the two jumps.

#include <stdio.h>

void delay(unsigned long loops)
{
	__asm__ __volatile__(
                "\tpushl %%cs\n"
                "\tpushl $doit\n"
                "\t.byte 0xcb\n"
                ".align 16\n"
 		"doit:\tdecl %0\n\tjns doit"
		:/* no outputs */
		:"a" (loops)
		:"ax");
}

main()
{
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   delay(0xffffffff);
   return 0;
}




Cheers,
Dick Johnson
                 ***** FILE SYSTEM WAS MODIFIED *****
Penguin : Linux version 2.1.123 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

[prev in list] [next in list] [prev in thread] [next in thread]