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Date: Thu, 26 Jan 2006 22:51:26 +0800
From: "Antonino A. Daplas" <adaplas@gmail.com>
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To: Hai Zaar <haizaar@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: vesa fb is slow on 2.6.15.1
References: <cfb54190601260620l5848ba3ai9d7e06c41d98c362@mail.gmail.com>
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Hai Zaar wrote:
> 
> # cat /proc/mtrr
> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
> reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
> reg02: base=0xc0000000 (3072MB), size= 512MB: write-back, count=1
> reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
> reg04: base=0xfeda0000 (4077MB), size= 128KB: uncachable, count=1
> 
> No 'write-combining' entry! But with 2.6.11.12 I do have one:
> <2.6.11.12 system> cat /proc/mtrr
> reg00: base=0x00000000 (   0MB), size=2048MB: write-back, count=1
> reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1
> reg02: base=0xc0000000 (3072MB), size= 512MB: write-back, count=1
> reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
> reg04: base=0xfeda0000 (4077MB), size= 128KB: uncachable, count=1
> reg05: base=0xf0000000 (3840MB), size= 128MB: write-combining, count=1

mtrr now defaults to off in vesafb because of conflicts with xorg/
xfree86.  You have to explicitly enable it with a boot option.  Try
this:

video=vesafb:mtrr:3,ypan

Tony