From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Jeff Chua <jeff.chua.linux@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 4GB Physical. Less than 3GB in Linux.
Date: Mon, 16 Apr 2007 16:17:22 +0200 [thread overview]
Message-ID: <46238572.5050203@s5r6.in-berlin.de> (raw)
In-Reply-To: <b6a2187b0704160028x3f979dc3s1c9e18995f229782@mail.gmail.com>
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.
>
> Tested on Linux 2.6.20, Linux 2.6.21-rc7.
The X60 most certainly contains a chipset which severely limits the
amount of accessible RAM due to issues with remapping of PCIe addresses.
Intel explains it somewhere on their web presence. A quick & lazy web
search turned this Intel paper up:
http://www.polywell.com/us/support/faq/4GB_Rev1.pdf
--
Stefan Richter
-=====-=-=== -=-- -==-=
http://arcgraph.de/sr/
next prev parent reply other threads:[~2007-04-16 14:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-16 7:28 Jeff Chua
2007-04-16 13:12 ` Fortier,Vincent [Montreal]
2007-04-16 14:17 ` Stefan Richter [this message]
2007-04-16 14:47 ` Jeff Chua
2007-04-16 18:25 ` Stefan Richter
[not found] <fa.wZS4ieAkOMvNOj61QiUn9aS+YeM@ifi.uio.no>
2007-04-16 14:33 ` Robert Hancock
2007-04-16 14:52 ` Jeff Chua
2007-04-16 19:56 ` Stefan Richter
2007-04-17 18:26 ` Jasper Spaans
2007-04-18 0:28 ` Jeff Chua
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