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SubjectRe: [PATCH] Athlon bug stomper. Pls apply.
On the Athlon 1300 Mhz with the patch but a working bios i get.

please consider uts 200 Mhz FSB.


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 21709 cycles per page
clear_page function '2.4 non MMX' took 13974 cycles per page
clear_page function '2.4 MMX fallback' took 13108 cycles per page
clear_page function '2.4 MMX version' took 13940 cycles per page
clear_page function 'faster_clear_page' took 5341 cycles per page
clear_page function 'even_faster_clear' took 5924 cycles per page

copy_page() tests
copy_page function 'warm up run' took 20559 cycles per page
copy_page function '2.4 non MMX' took 27741 cycles per page
copy_page function '2.4 MMX fallback' took 28340 cycles per page
copy_page function '2.4 MMX version' took 20802 cycles per page
copy_page function 'faster_copy' took 11894 cycles per page
copy_page function 'even_faster' took 12288 cycles per page


On Wed, 19 Sep 2001, Arjan van de Ven wrote:

> Dan Hollis wrote:
> >
> > On Wed, 19 Sep 2001, Linus Torvalds wrote:
> > > It is _probably_ an undocumented performance thing, and clearing that
> > > bit may slow something down. But it might also change some behaviour,
> > > and knowing _what_ the behaviour is might be very useful for figuring
> > > out what it is that triggers the problem.
> >
> > AFAIK noone has even tested it yet to see what it does to performance! Eg
> > it might slow down memory access so that athlon-optimized memcopy is now
> > slower than non-athlon-optimized memcopy. And if it turns out to be the
> > case, we might as well just use the non-athlon-optimized memcopy instead
> > of twiddling undocumented northbridge bits...
>
> Ok but that part is simple:
>
> run
>
> http://www.fenrus.demon.nl/athlon.c
>
> .....
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