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Date: Sun, 20 Nov 2005 19:15:10 -0800
From: Paul Saab <ps@freebsd.org>
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To: Dan Nelson <dnelson@allantgroup.com>
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Cc: current@freebsd.org, "Chad Leigh -- Shire.Net LLC" <chad@shire.net>,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell
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Dan Nelson wrote:
> In the last episode (Nov 20), Paul Saab said:
>   
>> Chad Leigh -- Shire.Net LLC wrote:
>>     
>>> I assume you are talking about the "phenomenon"  of RAM "missing" due 
>>> to PCI and other I/O mapping into the 4GB address space?  What struck 
>>> me about the OP is that the amount of RAM "missing" is more than I 
>>> have ever seen due to this.  My systems are usually 3.4-3.6GB of RAM 
>>> with 4GB installed, not 2.86GB (3005MB)...  So are we sure that the 
>>> PCI space mapping is the problem?
>>>       
>> Enable PAE and you'll get all your ram.
>>     
>
> Anyone know if it's possible for the kernel to determine if any RAM is
> mapped above the 4gb point and warn the user about how much memory is
> unaccessable without PAE?
>   
You mean like it does now?
"262144K of memory above 4GB ignored"