On Thu, Jul 19, 2007 at 03:48:36PM +0200, Andi Kleen wrote:
>
> From: William Lee Irwin III <[email protected]>
>
> PAE is useful for more than supporting more than 4GB RAM. It supports
> expanded swapspace and NX executable protections. Some users may want NX
> or expanded swapspace support without the overhead or instability of
> highmem. For these reasons, the following patch divorces CONFIG_X86_PAE
> from CONFIG_HIGHMEM64G.
What overhead of instability of highmem? Sorry folks but this is utter
bollocks. Back in the Caldera days we did a lot of measurement on highmem
overhead, and CONFIG_HIGHMEM has no measurable overhead at all on a system
that doesn't use it. CONFIG_HIGHMEM64G on the other hand has
a quite visible overhead on small systems, but that's entirely due to the
bigger page table entries that you need for NX.
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