linux-kernel - Re: mtrr registers with >= 4GB ram

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Message-ID: <86802c440807020949q31c7d039ua5d9a85caf9901f9@mail.gmail.com>
Date:	Wed, 2 Jul 2008 09:49:14 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	rb6@...e.edu
Cc:	linux-kernel@...r.kernel.org
Subject: Re: mtrr registers with >= 4GB ram

On Wed, Jul 2, 2008 at 7:55 AM, Rann Bar-On <rb6@...e.edu> wrote:
> As documented at https://bugs.launchpad.net/linux/+bug/210780 and
> http://www.rage3d.com/board/showthread.php?t=33821469 (as well as other
> places - google 4gb mtrr bug), the kernel appears to misdetect the mtrr
> registers on many machines with 4gb ram, causing all sorts of issues -
> especially with video drivers in X.  It is possible to rewrite the correct
> registers using a pretty hackish script, but the bug should probably be
> fixed at the kernel level.
>
> Please CC me personally when replying, as I'm not on LKML.  I'd be happy to
> try out patches if such come along :)

please try tip/master
http://people.redhat.com/mingo/tip.git/readme.txt

we have some patches there ...
      x86: mtrr cleanup for converting continuous to discrete layout, v8
      x86: mtrr cleanup for converting continuous to discrete layout v8 - fix
      x86: mtrr cleanup for converting continuous to discrete - auto detect v4
      x86: mtrr cleanup for converting continuous to discrete layout - fix #2

YH
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