Re: 4GB Physical. Less than 3GB in Linux.

[Jasper Spaans]

On 4/16/07, Jeff Chua <jeff.chua.linux@xxxxxxxxx> wrote:
> On 4/16/07, Robert Hancock <hancockr@xxxxxxx> 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.

Might be a setting in the bios... look for something like memory hole,
memory remapping, 4G DRAM, etc.

VrGr,
--
Jasper Spaans                                       http://jsp.vs19.net/

              This line was last modified 0 seconds ago.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/