On Mon, 2007-10-22 at 15:56 -0400, Matthew Saltzman wrote: > On Mon, 2007-10-22 at 12:20 -0400, Jesse Keating wrote: > > On Mon, 22 Oct 2007 12:03:05 -0400 > > Matthew Saltzman <mjs@xxxxxxxxxxx> wrote: > > > > > 32-bit runtime in general? Why? (Not a critical "why", a genuinely > > > curious "why"...) > > > > On those arches, running 64bit code comes at a penalty. In fact, even > > on x86_64 there is a penalty. Larger memory overhead. However on > > x86_64 the extra CPU registers gained by running in x86_64 mode > > outweigh the memory overhead. Not the case on ppc/sparc where there > > are no 'extra registers' to gain. Very little software in very few > > situations need 64bit. > > So on those archs one would want a 64-bit kernel and 32-bit apps, except > for large-memory programs or those needing 64/128-bit numerical types > (self-developed code, for example)? My reservation about this kind of talk is that no assumption as to which 32/64-bit userland exists should be made anywhere but perhaps in the default package set installed by anaconda - it is wrong to assume that all spins of Fedora will always have a 32-bit userland on 64-bit architectures or any such generalization ;-) Jon. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
