lkml.org 
[lkml]   [2003]   [Sep]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: RFC: [2.6 patch] better i386 CPU selection
On Sun, Sep 07, 2003 at 07:09:49PM +0100, Alan Cox wrote:
>...
> > I'm not sure if an Athlon is "lower" than a PII or not.... Which do I
> > option do I pick, to run on either of those without including
> > redundant stuff for older CPUs?
>
> Right now its ordered
>
> 386 - 486 - 586 - 586+TSC - 686 - PPro - PII - PIII - PIV
>
> Geode is a branch off 586+TSC and supports 686+ too
> Athlon branches off from PIII if I remember rightly
> Winchip branches off from 586 and supports all later x86 too
> ELAN is its own weird world
> Xmeta comes off 686 somewhere depending how you handle PGE

x86 is a complicated family...

My current list of CPU specific questions is:

- Does the Cyrix III support 686 instructions?
- Do -march=winchip{2,-c6} and -march=c3{,-2} add anything not in
-march=i686 (except optimizations of otherwise compatible code)?
- Which CPUs exactly need X86_ALIGNMENT_16?
- X86_GOOD_APIC: Are there really that many processors with a bad APIC?

TIA
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

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

\
 
 \ /
  Last update: 2005-03-22 13:48    [W:0.107 / U:4.460 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site