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Date: Thu, 1 May 2008 14:02:01 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH] x86: mtrr cleanup for converting continuous to discrete - auto detect v2
Cc: "Andrew Morton" <akpm@linux-foundation.org>, "Ingo Molnar" <mingo@elte.hu>,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Gabriel C" <nix.or.die@googlemail.com>,
       "Mika Fischer" <mika.fischer@zoopnet.de>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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On Thu, May 1, 2008 at 12:42 PM, H. Peter Anvin <hpa@zytor.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