Date: Sun, 22 Apr 2007 11:32:56 +0200 From: Erik Trulsson <ertr1013@student.uu.se> To: Artem Kuchin <matrix@itlegion.ru> Cc: freebsd-stable@freebsd.org Subject: Re: PAE does not give any ram increase, why? Message-ID: <20070422093256.GA43926@owl.midgard.homeip.net> In-Reply-To: <001e01c784be$9b969c20$0c00a8c0@Artem> References: <462A78F5.3090904@samsco.org> <001e01c784be$9b969c20$0c00a8c0@Artem>
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On Sun, Apr 22, 2007 at 01:14:17PM +0400, Artem Kuchin wrote: > > >>the number do not change with or without PAE > >> > >>Maybe i look in the wrong place? > >> > > > >I'm not going to waste my time explaining for the hundredth time how > >the x86 memory layout works. If you want to recover the missing > >256MB, go look in your BIOS for an option about memory hole remapping. > > No need, i know this stuff. Problem is that asus p5p800-vm bios does not > have such option (no memory remapping support in chipset) > , so, and simply assumed that in PAE mode this simply > does not matter and it will give me whole 4GB. Isn't it so? > Is it true for 64bit mode (amd64)? It is not so for either of PAE or 64-bit mode. What those give you is the ability to address memory above the 4GB limit. In order to access memory below the 4GB boundary that is shadowed by various I/O-devices, the RAM will have to be remapped to somewehere else. So if you could remap the memory then PAE or 64-bit mode would give you the ability to access it. If you can't remap it you can't get hold of it. -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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