Fedora kernel list - Jan 2008 - PowerPC config options

Couple of PowerPC related config things we might want to change.

1) CONFIG_TUNE_CELL.  Right now, this is set to Y on config-powerpc64.
That''s fine only because it doesn''t do anything until GCC 4.3
shows
up.  GCC 4.3 will hit rawhide soon, and we might want to turn this off
before then or the kernel will likely run slower on non-Cell CPU based
machines.

2) Why are we still building a separate powerpc32-smp kernel?  SMP
kernel''s work on UP machines, even for PowerPC IIRC.

josh

On Tue, 2008-01-15 at 21:01 -0600, Josh Boyer wrote:
> Couple of PowerPC related config things we might want to change.
> 
> 1) CONFIG_TUNE_CELL.  Right now, this is set to Y on config-powerpc64.
> That''s fine only because it doesn''t do anything until GCC
4.3 shows
> up.  GCC 4.3 will hit rawhide soon, and we might want to turn this off
> before then or the kernel will likely run slower on non-Cell CPU based
> machines.
Will do. I''d wondered about that myself quite recently -- not sure who
turned it on.
> 2) Why are we still building a separate powerpc32-smp kernel?  SMP
> kernel''s work on UP machines, even for PowerPC IIRC.
But not particularly efficiently, and _most_ ppc32 machines are UP.
For i386 SMP we have magic to NOP out the spinlocks, etc.

-- 
dwmw2