linux-kernel - Re: Speed of RAM reserved with memmap kernel command line option.

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Message-ID: <20111017132318.GA9098@citd.de>
Date:	Mon, 17 Oct 2011 15:23:18 +0200
From:	Matthias Schniedermeyer <ms@...d.de>
To:	Charles Buysschaert <Charles.Buysschaert@...opix.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Speed of RAM reserved with memmap kernel command line option.

On 17.10.2011 07:51, Charles Buysschaert wrote:
> Hello all, 
> 
> We are writing a PCI-e "frame grabber-like" driver for linux 2.6 kernel.
...
> I guess cache is not used. Does anyone know if there is a way to speed this up? How could we set that area to "cached"? 

Smells to me like you are missing a mapping in MTRR ...
Documentation/x86/mtrr.txt

... or PAT.
Documentation/x86/pat.txt

Bis denn

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