-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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. - -Rick - -- Rick Johnson, RHCE - [EMAIL PROTECTED] Linux/WAN Administrator - Medata, Inc. PGP Public Key: https://mail.medata.com/pgp/rjohnson.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (MingW32) Comment: Signed and/or encpryted for everyone's protection. iEYEARECAAYFAj3arssACgkQIgQdhlSHZgPPmgCg92iGLNXnrJpWgyz9t1coDSna d3gAmwcFFNHJwbD8Pdhb0idvIA9o0VxQ =xH1f -----END PGP SIGNATURE----- -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list
