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Date: Wed, 5 Mar 2003 13:49:37 +0100
From: Michael Vergoz <mvergoz@sysdoor.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: timothy.a.reed@lmco.com, linux-kernel@vger.kernel.org
Subject: Re: High Mem Options
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Hi Alan,

That i can't understand i when the system going to the protect mode. 
How the system can use over 4GB memory ?
On freebsd, when you have over 4GB the system say "XGB of XGB skiped..."
(i'v got a machine with 8GB running on freebsd and without memory spare)

Best regards,
Michael


On 05 Mar 2003 13:36:02 +0000
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:

> 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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