linux-kernel - Re: 4GB Physical. Less than 3GB in Linux.

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Date:	Tue, 17 Apr 2007 20:26:40 +0200
From:	"Jasper Spaans" <jasper@...9.net>
To:	"Jeff Chua" <jeff.chua.linux@...il.com>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 4GB Physical. Less than 3GB in Linux.

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

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/

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