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

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Date:	Thu, 1 May 2008 14:31:16 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.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

On Thu, May 1, 2008 at 2:26 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Yinghai Lu wrote:
>
> >
> > >
> > > >
> > > >
> > >  Yes, 16 GB systems are already mainstream; 32 GB is common, so I don't
> see
> > > any reason to stop at 2 GB.  Instead, it should loop up to the physical
> > > address size.
> > >
> >
> > but our objective is that has 0xd0000000-0xe0000000 (WC) not to be
> > overlapping with other MTRR entries (UC)..
> >
> >
>
>  So, pray tell, how comes this algorithm can come up with a non-solution to
> the problem presented to it?
>
>  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...

YH
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