RE: Hyperthreading

[Hugh Dickins]

On Thu, 22 Aug 2002, Nir Soffer wrote:
> 
> Grepping for MPENTIUM4 in the tree only shows up that it causes the
> kernel to be compiled with -march=i686, much like M686 and  MPENTIUMIII.
> Are there more subtle ways it affects the kernel that I missed? (in the
> 2.4.x tree)

arch/i386/config.in is where the processor characteristics CONFIG_X86_...
are derived from processor type.  There's only one difference between
the CONFIG_MPENTIUMIII configs and the CONFIG_MPENTIUM4 configs (in
2.4.18 or 2.4.19 or 2.4.20-pre4): CONFIG_X86_L1_CACHE_SHIFT 5 or 7.

Alan, that reminds me: 2.4.20-ac sets CONFIG_X86_L1_CACHE_SHIFT 7
when CONFIG_MPENTIUMIII: looks wrong, but perhaps there's a reason?

Hugh