Re: [PATCH] 2.6 workaround for Athlon/Opteron prefetch errata
From: Adrian Bunk
Date: Fri Sep 12 2003 - 13:28:16 EST
On Fri, Sep 12, 2003 at 01:59:43PM -0400, Jeff Garzik wrote:
> Andi Kleen wrote:
> >The main reason I'm really against this is that currently the P4 kernels
> >work
> >fine on Athlon. Just when is_prefetch is not integrated in them there will
> >be an mysterious oops once every three months in the kernel in prefetch
> >on Athlon.
>
>
> Booting a P4 kernel _without_ CONFIG_X86_GENERIC on an Athlon would be a
> user bug.
But even CONFIG_X86_GENERIC doesn't do what you expect. A kernel
compiled for Athlon wouldn't run on a Pentium 4 even with
CONFIG_X86_GENERIC.
Quoting arch/i386/Kconfig in -test5:
<-- snip -->
config X86_USE_3DNOW
bool
depends on MCYRIXIII || MK7
default y
<-- snip -->
My patch in the mail
RFC: [2.6 patch] better i386 CPU selection
tries to solve these problem with a different approach (the user selects
all CPUs he wants to support).
> Jeff
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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