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

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Message-ID: <481A372C.5080808@zytor.com>
Date:	Thu, 01 May 2008 14:33:32 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Gabriel C <nix.or.die@...glemail.com>,
	Mika Fischer <mika.fischer@...pnet.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete
 - auto detect v2

Yinghai Lu wrote:
>>  Overall, I'm feeling there is something really completely wrong if this
>> needs manual tunables of any sort.
> 
> the problem is BIOS set MTRR like BIG WB - SOME SAMLL UC to spare mtrr regs.
> 
> but later X server driver want to set some range to WC. that already
> is fallen in UC...

That's not the point.  I understand you want to flatten the layout.  The 
point is: why do you need manual tunables for the algorithm to do the 
right thing?

	-hpa
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