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

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Message-ID: <86802c440805011402h1e452b57ma27ffa6ad7b50238@mail.gmail.com>
Date:	Thu, 1 May 2008 14:02:01 -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 12:42 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Yinghai Lu wrote:
>
> > loop mtrr chunk_size and gran_size from 1M to 2G to find out optimal
> value.
> >
>
>  Why stopping at 2 GB?

if you select 4g for chunk size, we don't need to convert that from
continuous to discrete to make X server driver happen.

actually the code could support any chunk_size...

for example: 16 g system
orginal:
0-4g WB
3.5g-4g UC
4g-8g WB
8g-16g WB
16g-16.5g WB

if you set chunk size to 16g, and gran size <= 512M
you will get
0-16g WB
3.5g-4g UC
16g-16.5g WB

YH
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