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Date: Mon, 28 Apr 2008 18:01:58 +0200
From: Gabriel C <nix.or.die@googlemail.com>
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To: Mika Fischer <mika.fischer@zoopnet.de>
CC: Arjan van de Ven <arjan@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       yhlu.kernel@gmail.com, Andrew Morton <akpm@linux-foundation.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete
   layout v2
References: <200804272337.40130.yhlu.kernel@gmail.com>	<200804280206.52641.yhlu.kernel@gmail.com>	<20080428130826.GH27997@elte.hu> <20080428064925.318659b9@laptopd505.fenrus.org> <4815ED15.3080702@zoopnet.de>
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Mika Fischer wrote:
>>> how relevant is this feature with modern Xorg? I thought modern Xorg 
>>> would get its mappings via /sys, hence it would not have to touch
>>> MTRRs at all.
>> that's true for current X, but not for 6 month old X :=(
> 
> Ah, so the new X will be able to use the video memory in write-combining
> mode even if I have an MTRR saying this area is uncachable or write-back?
> 
> If that is the case, then I agree that this patch is not really needed.

I doubt there will be any usable Xorg release soon.
And I doubt peoples will run Xorg , mesa , etc master HEAD to have that feature. 

I think this patch is needed for now but as Ingo said , it should not be default.
Peoples with these sort problems could boot with some option to enables this workaround.

Just my opinion.

> 
> Regards,
>  Mika
> 

Gabriel