linux-kernel - Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v2

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Message-ID: <4815F4F6.1030708@googlemail.com>
Date:	Mon, 28 Apr 2008 18:01:58 +0200
From:	Gabriel C <nix.or.die@...glemail.com>
To:	Mika Fischer <mika.fischer@...pnet.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, yhlu.kernel@...il.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete
   layout v2

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
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