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SubjectRe: [PATCH] Athlon bug stomper. Pls apply.
On Wed, 19 Sep 2001, Dan Hollis wrote:

> We definitely need more data points too. So far we dont have any athlon.c
> data for kt133a with the bit on and off, only kt133.

My system is a kt133a, that show the bug. I have run a hundred tests,
first in a Athlon optimized kernel with the patch (55.7=0) then with a non
optimized kernel (55.7=1).

Here are some typical results:

K7 optimized:
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
clear_page() tests
clear_page function 'warm up run' took 19862 cycles per page
clear_page function '2.4 non MMX' took 12296 cycles per page
clear_page function '2.4 MMX fallback' took 12068 cycles per page
clear_page function '2.4 MMX version' took 14936 cycles per page
clear_page function 'faster_clear_page' took 4393 cycles per page
clear_page function 'even_faster_clear' took 4362 cycles per page

copy_page() tests
copy_page function 'warm up run' took 22513 cycles per page
copy_page function '2.4 non MMX' took 26280 cycles per page
copy_page function '2.4 MMX fallback' took 26275 cycles per page
copy_page function '2.4 MMX version' took 22537 cycles per page
copy_page function 'faster_copy' took 10983 cycles per page
copy_page function 'even_faster' took 11122 cycles per page

and here without:
Athlon test program $Id: fast.c,v 1.6 2000/09/23 09:05:45 arjan Exp $
clear_page() tests
clear_page function 'warm up run' took 12871 cycles per page
clear_page function '2.4 non MMX' took 12325 cycles per page
clear_page function '2.4 MMX fallback' took 12586 cycles per page
clear_page function '2.4 MMX version' took 12021 cycles per page
clear_page function 'faster_clear_page' took 4401 cycles per page
clear_page function 'even_faster_clear' took 4370 cycles per page

copy_page() tests
copy_page function 'warm up run' took 19568 cycles per page
copy_page function '2.4 non MMX' took 25353 cycles per page
copy_page function '2.4 MMX fallback' took 25316 cycles per page
copy_page function '2.4 MMX version' took 19541 cycles per page
copy_page function 'faster_copy' took 11052 cycles per page
copy_page function 'even_faster' took 10785 cycles per page

I thought that when I run the program in the non-optimized kernel with
55.7=1, the program was supposed to crash the system, but it doesn't seem
to do. Isn't the program the K7 optimized fast_copy_page()? Weird.

--
Roberto Jung Drebes <drebes@inf.ufrgs.br>
Porto Alegre, RS - Brasil
http://www.inf.ufrgs.br/~drebes/

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