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SubjectRe: [PATCH] Athlon bug stomper. Pls apply.
On Wed, Sep 19, 2001 at 09:15:17PM +0000, Petr Vandrovec wrote:
> On 19 Sep 01 at 19:55, Arjan van de Ven wrote:
> > Ok but that part is simple:
> >
> > run
> >
> > http://www.fenrus.demon.nl/athlon.c
>
> Small question - is it OK that 'faster_copy' is faster than
> 'even_faster'?

Yeah; both are "new style" with a minor variation, "even_faster" is
basically my test victim, and faster_ is the "last known good" one.

> clear_page function '2.4 MMX version' took 8508 cycles per page
> clear_page function 'faster_clear_page' took 4016 cycles per page
> clear_page function 'even_faster_clear' took 3916 cycles per page

Yup, > 2x improvement, that's expected
>
> copy_page() tests
> copy_page function '2.4 MMX version' took 15163 cycles per page
> copy_page function 'faster_copy' took 8569 cycles per page
> copy_page function 'even_faster' took 8805 cycles per page

same here

If it were only 5%, I would vote for disabling the optimisation given the
number of problems; however it's 2x _and_ you can trigger the bug as normal
user from userspace too... so we need to fix the hardware/bios.

Greetings,
Arjan van de Ven
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