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

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Date:	Thu, 1 May 2008 08:09:27 -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] x86: mtrr cleanup for converting continuous to discrete
 - auto detect

On Thu, 1 May 2008 01:00:34 -0700 Yinghai Lu wrote:

> 
> loop mtrr chunk_size and gran_size from 1M to 2G to find out optimal value.

What size step (increment) is used for these loops?

> so user don't need to add mtrr_chunk_size and mtrr_gran_size, 
> 
> if optimal value is not found, print out all list to help select less optimal
> value.
> 
> add mtrr_spare_reg_nr= so user could set 2 instead of 1, if the card need more entries.
> 
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
> 

> Index: linux-2.6/Documentation/kernel-parameters.txt
> ===================================================================
> --- linux-2.6.orig/Documentation/kernel-parameters.txt
> +++ linux-2.6/Documentation/kernel-parameters.txt
> @@ -613,9 +613,17 @@ and is between 256 and 4096 characters. 
>  			that could hold holes aka. UC entries.
>  
>  	mtrr_gran_size=nn[KMG] [X86]
> -			used for mtrr cleanup. It is granity of mtrr block.
> +			used for mtrr cleanup. It is granularity of mtrr block.
> +			default is 1.

                        Default

>  			Big value could prevent small alignment use up MTRRs.

			Large value could prevent small alignment from
			using up MTRRs.

>  
> +	mtrr_spare_reg_nr=n [X86]
> +			Format: <integer>
> +			range: 0,7 : spare reg number
> +			default : 1
> +			used for mtrr cleanup. It is spare mtrr entries number.

			Used

> +			set to 2 or more if your graphical card need more.

			Set                                     needs more.

> +
>  	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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