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Subject: Re: problems with 1gb ddr memory sticks on linux
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Bryan K. Walton" <thisisnotmyid@tds.net>
Cc: linux-kernel@vger.kernel.org
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Date: 08 Aug 2002 20:46:52 +0100
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On Thu, 2002-08-08 at 17:39, Bryan K. Walton wrote:
> Dimm slot 1 = 256MB DDR PC2100 and
> Dimm slot 2 = 1024MB DDR PC2100
> 
> and the /proc/mtrr shows:
> 
> casa:~# cat /proc/mtrr
> reg00: base=0x00000000 (   0MB), size= 512MB: write-back, count=1 

Your BIOS misconfigured the memory control registers. You may find
swapping the DIMMs over fixes that or a BIOS update. If you don't want
to update your BIOS then doing

echo "base=0x00000000 size=0x60000000 type=write-back" >/proc/mtrr

should override the BIOS setting and make your machine speed up.

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