linux-kernel - Re: [PATCH 1/2] x86: mtrr cleanup for converting continuous to discrete layout v8

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Message-Id: <20080429134617.1bc3b2d5.randy.dunlap@oracle.com>
Date:	Tue, 29 Apr 2008 13:46:17 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	yhlu.kernel@...il.com
Cc:	Yinghai Lu <yhlu.kernel.send@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	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 1/2] x86: mtrr cleanup for converting continuous to
 discrete layout v8

On Tue, 29 Apr 2008 03:52:33 -0700 Yinghai Lu wrote:

> Index: linux-2.6/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/kernel-parameters.txt
> +++ linux-2.6/Documentation/kernel-parameters.txt
> @@ -595,6 +595,20 @@ and is between 256 and 4096 characters. 
>  			See drivers/char/README.epca and
>  			Documentation/digiepca.txt.
>  
> +	disable_mtrr_cleanup [X86]
> +	enable_mtrr_cleanup [X86]
> +			The kernel tries to adjust MTRR layout from continuous
> +			to discrete, to make X server driver able to add WB
> +			entry later. This parameter enables/disables that.
> +
> +	mtrr_chunk_size=nn[KMG] [X86]
> +			used for mtrr cleanup. It is largest continous chunk
> +			that could hold holes aka. UC entries.
> +
> +	mtrr_gran_size=nn[KMG] [X86]
> +			used for mtrr cleanup. It is granity of mtrr block.

s/granity/granularity/
I think that's what you mean/want.

How does someone know that size/granity/whatever of an mtrr block?


> +			Big value could prevent small alignment use up MTRRs.
> +
>  	disable_mtrr_trim [X86, Intel and AMD only]
>  			By default the kernel will trim any uncacheable
>  			memory out of your available memory pool based on

---
~Randy
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