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Date: Tue, 9 Sep 2008 19:05:28 +0300
From: Adrian Bunk <bunk@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Arjan van de Ven <arjan@...radead.org>,
x86 maintainers <x86@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] x86 fixes
On Mon, Sep 08, 2008 at 12:30:02PM -0700, Linus Torvalds wrote:
>...
> - "modern 32-bit": PPro and better. Can take CMOV, MMX and TSC for
> granted.
>
> Yes, there are graduations to the above, but reasonably, those three are I
> think the "architectural" big versions. The rest should be:
>
> - pure "tuning" options. A Pentium 4 is different from Core 2 in tuning,
> and the best code sequences can be very very different, but the binary
> should work on both.
>
> - with *dynamic* choices for the differences that are architecturally
> visible.
>
> Ie the whole choice of syscall/sysenter/int80 is dynamic, not specified
> statically at compile time with a config option. So are things like the
> different XMM versions etc.
>...
We use 3DNow! for bigger memcpy's if the kernel is configured for a K7.
How does this fit into your picture?
> Linus
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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