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Date:      Sun, 20 Nov 2005 19:15:10 -0800
From:      Paul Saab <ps@freebsd.org>
To:        Dan Nelson <dnelson@allantgroup.com>
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
Message-ID:  <43813BBE.2010302@freebsd.org>
In-Reply-To: <20051121030915.GC41629@dan.emsphone.com>
References:  <20051120183309.ysgk624asksckwow@mail.bafirst.com> <20051121004749.GA39061@xor.obsecurity.org> <43812AC7.3020506@rogers.com> <20051121020816.GA19252@xor.obsecurity.org> <C033B3B6-12A3-4428-A6B4-B51C6B09EB26@shire.net> <438136B5.9030506@freebsd.org> <20051121030915.GC41629@dan.emsphone.com>

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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"





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