Red Hat Bugzilla – Bug 386891
wish: build separate glibc packages for cpu submodels on powerpc
Last modified: 2007-11-30 17:12:22 EST
Optimized glibc builds can influence system performance greatly. This is
especially true on powerpc systems, where a lot of cpu variants exist. Up to
now, the glibc package provides an additional library set for power6, while
standard libraries are compiled for 604 or common? I'm just guessing...
While it would be a waste of space to support all varities of cpus in a single
glibc package, I suggest to split it into several sub-packages, e.g.
- glibc-common (required)
- glibc-power6 (with power6 directory, compiled with -mcpu=power6)
- glibc-cell (with ppc-cell-be directory, compiled with -mcpu=970
The same holds also for kernels.
I found noticeable performace improvements using my own kernel and glibc
(build with -mcpu=970 or mcpu=cell using ppu-gcc) on my PS3 system (but not on
This would be a maintainance nightmare, plus glibc on ppc and ppc64 already
builds about 3 times longer or more than on other architectures.