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Re: linux-image for i586

On Fri, 12 Nov 2010 16:49:11 +0700
Sthu Deus <sthu.deus@gmail.com> wrote:

> Thank You for Your time and answer, Johan:
> > The i486 kernel will run on an i586 box.  Even if you compile the
> > kernel for i586 how much speed are you really going to get?  A few
> > percent? And how much time do you spend in kernel as opposed to
> > userland?  Maybe 3-20 percent depending on what you are doing right?
> > So, in rough numbers, that's a 10% off on 10% of what you do for a
> > net of roughly 1%.
> Actually I am not so much concerned as to speeding up the machine as
> for using its all abilities - MMX tech. for example. I do not in any
> case - know if it helps - just my opinion as there are different
> packages for different CPUs. In past times I saw for i586 CPU packages
> in another distro.

Not all i586-CPUs have MMX, so I'm not sure if the kernel would use MMX
in i586-mode (despite for runtime-mmx-detection, but this option you
can have without march=i586). And you are always free to 
a) compile a kernel with march=i586
b) use mmx in your favorite userland application


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