On 21/12/2009 21:21, Joerg Sonnenberger wrote: > On Mon, Dec 21, 2009 at 10:17:12PM +0100, Jean-Yves Migeon wrote: >> BTW, given that all mainstream x86 CPUs support PAE today, shouldn't >> PAE support be made more dynamic, by checking if feature is present >> (through CPUID for example), and adapt accordingly? > > That would mean switching the pmap at run time or using a more dynamic > pmap, both could cost performance. Using PAE really only makes sense if > high memory is present or NX on AMD cpus is desired. In addition paddr_t's would be needlessly large for systems without PAE. As far as I know, no operating system currently supports both modes in one kernel. I also have a patch that enables NX, see previously linked notes - however I'm experiencing some oddities in that area which I'm still working on. -- Thanks, Jeremy
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