Messages in this thread | | | Date | Mon, 16 Apr 2007 22:52:43 +0800 | From | "Jeff Chua" <> | Subject | Re: 4GB Physical. Less than 3GB in Linux. |
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On 4/16/07, Robert Hancock <hancockr@shaw.ca> wrote: > Jeff Chua wrote: > > I've noticed that with 4GB physical ram, I'm only see 3098000 MB on > > the Dell 745, and 3107056MB on the IBM X60s. > > > > I've tested with CONFIG_HIGHMEM4G=y, CONFIG_HIGHMEM64G=y, > > CONFIG_X86_PAE=y, but nothing makes any difference. > > Chipset limitation. It uses up most of the MMIO region above 3GB > preventing RAM from being mapped there, and doesn't support remapping > the covered RAM to above 4GB. Nothing the kernel can do about it.
Well, I guess I learned the hard way. So it's better not to buy 4GB ... it turns out to be the same as buying one with just 3GB RAM.
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