Tzafrir Cohen wrote:

> That is not exactly correct.
> 
> Redhat provide kernel optimized for i386, i586, i686 and athlon, and glibc
> for i386 i586 and i686 (not for athlon, right?).
> 
> I figure that those two are not enough, and there is some extra value from
> some other packages. But there is a price in complexity.
> 
> What added value is from optimizing everything? Why not optimize the most
> CPU-intensive packages?
> 
> Or maybe make it easier to rebuild optimized packages?

This question has been a mystery for me too;

Even if we assume that some people still haven't upgraded to P4 and
still use P3, and even^2 if we assume that some people still use P2,
and even^3 if we assume that some people still use Pentium1, then why
the hell doesn't RH upgrade at least to i586 and still supports i386 ?!

I think the reason was written by one of the many people who responded:
Some competitors of Intel, such as AMD, don't support some of the
recent instructions of Intel, even in their newest precessors.

And don't think only about AMD; There is also Transmeta which emulates
the instruction set and I'm not sure they emulate the latest
instruction-set. There are virtual machines (such as VMware) (although
I run Mandrake as a guest, flawlessly).

But the real mystery is the amazing results that Diego achieved ON THE
SAME COMPUTER; If 386-compiled executables run faster than 586-compiled
and 686-compiled, then RH decision is clear and understood, but the
amazing results are less understood.

Anybody from Intel to explain how it is possible?

-- 
Eli Marmor
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CTO, Founder
Netmask (El-Mar) Internet Technologies Ltd.
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