Date: Mon, 31 Oct 2005 21:03:57 -0800
From: thockin@hockin.org
To: "Martin J. Bligh" <mbligh@mbligh.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Alejandro Bonilla <abonilla@linuxwireless.org>,
       Marcel Holtmann <marcel@holtmann.org>, Dave Jones <davej@redhat.com>,
       linux-kernel@vger.kernel.org
Subject: Re: 4GB memory and Intel Dual-Core system
Message-ID: <20051101050357.GA15949@hockin.org>
References: <20051027205921.M81949@linuxwireless.org> <1130447261.5416.20.camel@blade> <20051027211203.M33358@linuxwireless.org> <20051027220533.GA18773@redhat.com> <1130451071.5416.32.camel@blade> <20051027221253.GA25932@redhat.com> <1130451421.5416.35.camel@blade> <20051027221756.M55421@linuxwireless.org> <1130711165.32734.11.camel@localhost.localdomain> <12100000.1130799788@flay>
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On Mon, Oct 31, 2005 at 03:03:08PM -0800, Martin J. Bligh wrote:
> > Wrong IA-32 supports more than 4Gb in PAE 36bit physical 32bit virtual
> > mode and has done since the Preventium Pro
> 
> Indeed ... I have 64GB ia32 boxes ;-)

And Intel server chipsets do support remapping.  I've seen boards with 2
GB IO holes remapped above 4 GB.

A 4 GB system reports 6 GB of memory, 4 of which are usable as DRAM.
Intel doesn't document it, but there's a slight performance hit for the
remapped memory, too.
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