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Date: Thu, 1 May 2008 16:10:14 -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>,
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On Thu, May 1, 2008 at 3:57 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> Yinghai Lu wrote:
>
> >
> > only search 78
> > 2g, 1g, ...1m, and half matrix 13 * 6..
> >
> > and don't need to search than 78.
> >
> >
>
>  Again, it's not clear to me why there is an inherent limit at 2 GB.

above 2g, we will use 4g (chunk size, because if use 4g gran_size will
trim too much RAM). it will get the continous layout like
0-4g WB
3.5g-4G UC

instead of discrete that we want. (chunk_size=2g, gran_size=512M)
0-2g WB
2g-4g WB
3.5g-4g UC

YH