-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 And to reply to myself - I've discovered that if you use the following command:
rpm --rebuild --target <arch>-redhat-linux-gnu rpmname.src.rpm or rpm --rebuild --target <arch>-linux-gnu rpmname.src.rpm (they're synonimous since one symlinks to the other in /usr/lib/rpm) so entering your directory of latest SRPMS and running: rpm --rebuild --target athlon-redhat-linux-gnu *.src.rpm could do the trick - rebuilding all packages for an athlon system, placing all rpms within /usr/src/redhat/RPMS/athlon. In a test rebuild for the latest gnupg package, it did use the march=athlon flag. I'm sure, however, that the arch needs to be within the rpmrc file. If you want to create one that does athlon-xp it could work. However, it appears you'd need to add macros, and plenty of other fun stuff within /usr/lib/rpm. Unless you think your apps would benefit from the difference between athlon and athlon-xp (SSE), it's probably not worth the extra effort. Valid arch's by default are for x86 systems: i386-redhat-linux-gnu i486-redhat-linux-gnu i586-redhat-linux-gnu i686-redhat-linux-gnu athlon-redhat-linux-gnu noarch-redhat-linux-gnu (which points to i386) It's tempting to try this on an older system to see if there's a noticable performance increase. If anyone else does/has - post the performance increases to the list - many of us would like to know if it's worth the effort. Hope this helps, - -Rick - -- Rick Johnson, RHCE - [EMAIL PROTECTED] Linux/WAN Administrator - Medata, Inc. PGP Public Key: https://mail.medata.com/pgp/rjohnson.asc Rick Johnson wrote: | Adam Bowns wrote: | | I am considering rebuilding all the rpm's in use on my system so they | | are optimised for my processor, but I have a few questions I would | | really like to know the answer to before i start :-) | | | | Funny - I was just pondering doing the same exact thing. Only reason I went | about some of them is that I wanted to use some newer (Rawhite/Red Hat 8.0) | packages on some 7.3 machines, so I needed to recompile them w/ GCC 2.9.6. | | | 1.Will it increase performance significantly ? | | I've watch the rebuild compile and the compilier does receive the mcpu=i686 | flag at times. However, the resuilting RPM is still .i386.rpm because it's | i386 compatible. Unless you can figure out the speicfic rpmrc flags to make | it compile with athlon-xp specific code, it may not help a whole lot. | | | 2.Is rpmbuild fully linked into gcc ? Can i use all the flags mentioned | | in | | | | | http://gcc.gnu.org/onlinedocs/gcc-3.2/gcc/i386-and-x86-64-Options.html#i386%20and%20x86-64%20Options | | | | | ~From what I can tell in the rpmrc's wihtin /usr/lib/rpm - if you're | running | an i686, the flags will be included if appropriate. From what I can tell - | they're not specific unless you tell it otherwise. | | However - by default - all others are translated to i386 with the following | lines: | | buildarchtranslate: athlon: i386 | buildarchtranslate: i686: i386 | buildarchtranslate: i586: i386 | buildarchtranslate: i486: i386 | buildarchtranslate: i386: i386 | | The i386 optflags line has the following: | | optflags: i386 -O2 -march=i386 -mcpu=i686 | | Therefore the packages would be built for i386, but with i686 optimizations | by default. | | I think you could probably customize this within /etc/rpmrc or ~/.rpmrc to | override this for athlons and add any flags you desire. | | Dig around the rpmrc file for more info. | | | 3.Also, any experiences you have with rebuilding rpm's for athlon-xp | | architecture would be of interest to me. | | Beyond contemplation, I haven't done much w/ this. Given that the | default is | to include -mcpu=i686 -march=i386 - you're getting 386 code with 686 | optimizations (if I'm reading the man pages correctly). For most of us, | that's probably good 'nuff. Red Hat has built specific i686 packages for | those libraries that benefit most from the changes. For 8.0, that includes | the kernels, glibc, and openssl. | | Correct me if I'm wrong. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (MingW32) Comment: Signed and/or encpryted for everyone's protection. iEYEARECAAYFAj3aud0ACgkQIgQdhlSHZgPW2wCg2cTsqZeF1q43CouMxhCgiaVQ +LUAoL3qeI4PnCj6Iv4HQT+aHRzXepjn =usPO -----END PGP SIGNATURE----- -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list
