On Wed, 2006-05-17 at 15:43 -0300, Juliano Morais Barbosa wrote: > I have gentoo 2.6.16-gentoo-r1-Flexsolutions #1 SMP Thu Mar 30 08:21:07 BRT > 2006 x86_64 AMD Athlon(tm) 64 Processor 3500+ AuthenticAMD GNU/Linux with > 4Gb of RAM but in top I see 3Gb, and the kernel don´t have option for High > Memory Option. > >
This is a case of the motherboard reserving address space in the 32-bit range for things like AGP aperture, BIOS shadowing, and so on. There is nothing linux can do about it. You can either a) get the motherboard to shift the displaced RAM above 4G (many motherboards can do this), or b) get the motherboard to shift the address space reservations above 4G (I've only ever heard of one motherboard that can do this). If you motherboard can do neither, then you must contact the manufacturer for a solution, or, at worst, buy a new motherboard. Daniel
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