On Thursday 26 August 2004 11:40 am, Alexander Dalloz wrote: [snip] > This is an alway returning question, asked time by time. The RPMs of > Fedora Core are build for arch i386 with optimization enabled for P4 > CPU. So they are able to run on all i386 platform and will use special > instructions on newer CPUs. Yes, this comes up all the time. Unless they changed tp P4 optimization in FC3, though, the build flags are what they've aleays been: --march=i386 -mcpu=i686 That is, 386-compatible, but instruction organization optimized for a Pentium Pro/II/II. How much improvement you'd see by building with "-march=pentium4" is left as an exercise for the reader. Also, I wonder about the quality of the P4 GCC optimizations in general. Back when the current version was 3.2.x I read on the GCC mailing list that the P4 optimization probably wouldn't be fully realized until v3.4. As the default compile for FC2 is v3.3.3, I wonder if the P4-specific handling is completely baked.
