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Subject: Re: High Mem Options
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Michael Vergoz <mvergoz@sysdoor.com>
Cc: "Reed, Timothy A" <timothy.a.reed@lmco.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Wed, 2003-03-05 at 12:11, Michael Vergoz wrote:
> Hi Tim,
> 
> Every system can NOT manage more than 4GB memory on x86 processor (32 bits processor).
> Because the system addressing is limited to 32Bits, well memory > 4GB is used generaly for memory spare...

x86 has 36bit physical addressing, its a truely bonkers implementation
but it does have the facility. The limt in reality is 3Gb per process
(1Gb is used for kernel mapping - we could do 4Gb per process but the
syscall cost would go up a lot).

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