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

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Message-ID: <4623D4DA.60600@s5r6.in-berlin.de>
Date:	Mon, 16 Apr 2007 21:56:10 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Jeff Chua <jeff.chua.linux@...il.com>
CC:	Robert Hancock <hancockr@...w.ca>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 4GB Physical. Less than 3GB in Linux.

Jeff Chua wrote:
> On 4/16/07, Robert Hancock <hancockr@...w.ca> wrote:
>> 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.

Except for minimal performance differences if the 3GB configuration
doesn't support dual-channel mode.  (Not worth the price difference to 4GB.)
-- 
Stefan Richter
-=====-=-=== -=-- =----
http://arcgraph.de/sr/
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