linux-kernel - Re: mtrr madness

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Date:	Mon, 01 Sep 2008 11:19:01 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
CC:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: mtrr madness

Lukas Hejtmanek wrote:
> Hello,
> 
> it seems that all linux kernels contain a bug with mtrr:
> 
>  cat /proc/mtrr 
> reg00: base=0x00000000 (   0MB), size=198656MB: write-back, count=1
> reg01: base=0x80000000 (2048MB), size=197120MB: write-back, count=1
> reg02: base=0x9fc00000 (2556MB), size=196612MB: uncachable, count=1
> reg03: base=0x100000000 (4096MB), size=200704MB: write-back, count=1
> reg04: base=0x200000000 (8192MB), size=204800MB: write-back, count=1
> 
> (watch the size)
> 
> it is definitely  present in the kernels 2.6.16, 2.6.24, 2.6.25, 2.6.26.
> 
> 198656 is 0x3080000000, the correct value would be 0x80000000, similarly
> 197120 is 0x3020000000, the correct would be 0x20000000. 

Those are set up by the BIOS, so it would be what's at fault. I think we 
may be adding something to fix this up though?
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