Given the loud feedback, I've updated the proposal at: https://fedoraproject.org/wiki/Features/F12X86Support The revised proposal: - Build all packages for i686 (this requires cmov) - Optimize for Atom Why? - We don't really support i586 in any meaningful matter - OLPC still works with base i686 - We are likely doing a mass rebuild for F-12 anyways, might as well switch while we're doing it - Atom is the only currently produced 32-bit x86 chip of note; optimize for what's currently available If you want numbers, I did some benchmarking of code [1] with various build options on a variety of processors, with the F-11 gcc code. All of these results are relative to a F-11 baseline of "-march=i586 -mtune=generic". P4 2.4Ghz Athlon 3400+ Core2Duo E6850 Atom N270 march=i686/ -1.1% +2.0% +0.9% +0.6% mtune=generic march=i586/ +0.3% -0.3% -0.2% +1.3% mtune=atom march=i686/ -1.5% +1.2% +0.5% +1.7% mtune=atom Bill [1] gzip, bzip2, math simulation, mp3 encode/decode, ogg encode/decode -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
