686x for Fedora Core
Peter Backlund
peter.backlund at home.se
Sat Nov 29 23:41:50 UTC 2003
Ed wrote:
> Are there plans in the near future to introduce Fedora Core compiled for 686
> processors?
(Almost) all rpms in FC are built with -march=i386 -mpcu=i686, meaning
that they are optimised for 686 but will run on all 386 hardware.
Certain key packages, such as glibc and kernel, are built for specific
architectures, i.e. -march=athlon or -march=i686. That's being done in
the areas where the largest benefits are made.
In general, I'd say no one has been able to prove that compiling each
and every application with aggressive optimisation and/or architecture
specific instructions give any measurable speed improvements. There are
several compiler experts on this list that can explain why.
That said, if anyone can point to a package that would benefit a lot
(more than 5%) from -march, I'm all for including that in FC. But show
the numbers, no "man, -O3 made KDE so much 'snappier'!" stories :-)
/Peter
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