Am Do, den 26.08.2004 schrieb David Cary Hart um 18:26: > Most of the Fedora RPMS are provided as i386. These can easily be > recompiled as: > > rpmbuild --target i686 --rebuild package.src.rpm > > a. Is it worth it? In other words, is there really a performance gain in > packages like - say - KDE? Mostly not. 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. If you count the time to proceed the custom compilation it is not worth the efforts. > b. Assuming that I installed the RPM sources and built from the spec > file, as long as I am at it, could I also benefit by changing some of > the FLAGS? > > For example: > CHOST="i686-pc-linux-gnu" > CFLAGS="-march=pentium4 -O3 -pipe -fomit-frame-pointer" This is the "Gentoo geek factor". The compilation for P4 architecture does not increase anything significantly but makes packages incompatible to other CPUs. The -O3 flags does not mean better optimization than -O2 and thus better performance in general. -O3 does not mean better, but can make things worse. If you have too much time, then I suggest you spent it to help in development making Fedora even better ;) Alexander -- Alexander Dalloz | Enger, Germany | GPG key 1024D/ED695653 1999-07-13 Fedora GNU/Linux Core 2 (Tettnang) kernel 2.6.8-1.521smp Serendipity 18:33:12 up 6 days, 14:15, load average: 1.15, 1.15, 1.17
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