linux-kernel - Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately?

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Date:	Mon, 4 Jun 2007 17:59:59 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Justin Piszcz" <jpiszcz@...idpixels.com>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Andi Kleen" <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately?

On 6/4/07, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> Exactly, and given that this is a fairly easy thing to do, and that
> occasionally we see systems where this happens (even if their BIOS is
> later fixed).  It is likely worth it for someone to write up the patch
> and that compare MTRRs with available memory, and to complain and
> reserve all memory that MTRRs claim is not write-back.
>
that is good.
Sometime BIOS can not even keep mtrr to the identical between
different CPU in SMP system.

Or reset mtrr according to e820 table.

YH
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