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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
