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

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Message-ID: <86802c440805011610o2d3cd00cx1a4abb5d0967c712@mail.gmail.com>
Date:	Thu, 1 May 2008 16:10:14 -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 3:57 PM, H. Peter Anvin <hpa@...or.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
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