On Mon, Jan 26, 2009 at 11:15:01AM +0100, Jakub Jelinek wrote: >Hi! >Similarly, I wonder what CPUs we want to support in Fedora for PowerPC, >if e.g. -march=power4 default wouldn't be possible. On s390, is somebody For ppc, the most common hardware would be the G4 PowerMacs. Use of -march=power4 would seem suboptimal there. Which sort of sucks because we run as much of the OS as we can at 32-bit, even on 64-bit hardware. I'll look at this a bit more today and see what -march=power4 would really do here in terms of compatibility. For ppc64, using -march=power4 would be fine with me. We don't really claim to support the POWER3 or older 64-bit hardware, and POWER4 is fairly close to the most common CPU (ppc970 in the G5 Mac/Powerstation). >Another question is if we finally could bump the minimum supported kernel >version in Fedora 11 glibc. Currently Fedora 10 glibc requires 2.6.9 or >later kernel, which means it can't assume a lot of stuff (e.g. private >futexes, a lot of added syscalls etc.), which means it has to test for them >at runtime of every program (e.g. every threaded program does a dummy futex >syscall to check for private futexes, for futex realtime clock support and >has to use variables for this, instead of oring constants in the mutexes >etc., and glibc has to check for ENOSYS and have fallbacks compiled in). >2.6.9 default comes I think still from the RHEL4 kernels. >Could we bump this ideally to 2.6.29? It would mean Fedora 11 userland >only runs on 2.6.29 and later kernels, but we could gain speed and decrease >size of glibc shared libraries. > >For the -march/-mcpu default changes, I think nothing is required from the >koji build infrastructure (I don't think there are 31-bit mainframes >around in koji/brew and I don't think there are 32-bit powerpcs or >i386/i486s among the build boxes either), on the other side that decision >has to be made almost immediately (before the world is rebuilt with gcc >4.4.0). I'm going to assmue that you are wanting a mass-rebuild of all of Fedora with gcc 4.4. Is that going to land this week? From a scheduling perspective, if a rebuild is going to happen it would be fairly important to have most of it done by Beta. Feature freeze is March 3rd. Beta freeze is March 10. >For glibc --enable-kernel= default this requires that all koji build boxes >and anything else that needs to run Fedora 11 binaries runs at least 2.6.29 >kernels, but the change might be still delayed for a few weeks. The koji build boxes all run RHEL 5. Getting them upgraded to a not-yet- released kernel seems unlikely. josh -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
