On 04-Dec-08 10:56, Benjamin Herrenschmidt wrote: > I'm pretty confident that the benchmarks will show a significant benefit > in having userland mostly 32 bits tho.
I made some tests and compared a 32 bit powerpc chroot environment with a 64 bit ppc64 chroot environment on a PowerMac G5 running a 64 bit kernel. I could not find any significant differences so far. Within a few percent, the standard utilities appear to work at the same speed. Sometimes the 64 bit environment seems to be slightly faster. Of course those first results are not conclusive. I did not have time to make any rigourous benchmarks yet. > Anyway, first thing first is to get some relatively up to date glibc in > debian, without that, it's all useless. glibc had things like TLS/NPTL > support for ppc32 for ages for example, but debian doesn't have it. For my ppc64 porting efforts, I have patched Debian glibc up to current CVS. I had to sort out which of the 120 Debian patches still apply and found that about 90 of them are already in CVS or not needed anymore. Regards Andreas Jochens
