linux-kernel - Re: AGP and PAT (induced?) problem (on AMD family 6)

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Message-ID: <20080806135114.GB6713@alberich.amd.com>
Date:	Wed, 6 Aug 2008 15:51:14 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Rene Herman <rene.herman@...access.nl>
CC:	Dave Airlie <airlied@...il.com>, Shaohua Li <shaohua.li@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	dri-users@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: AGP and PAT (induced?) problem (on AMD family 6)

On Mon, Aug 04, 2008 at 06:30:32PM +0200, Rene Herman wrote:
> What _does_ solve this though is booting with the "nopat" command line 
> parameter. I'm on 2.6.26.1 and have enabled PAT for my AMD Duron myself. 
> With "nopat", there's no problem to be seen anymore -- exiting X 
> specifically is instantaneous.
>
> With or without PAT, my /proc/mtrr is always:
>
> reg00: base=0x00000000 (   0MB), size= 512MB: write-back, count=1
> reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
> reg02: base=0xe8000000 (3712MB), size=  64MB: write-combining, count=1
>
> under X joined by:
>
> reg03: base=0xe4000000 (3648MB), size=  32MB: write-combining, count=2

To get some more debug data, can you please retest with latest kernel
(2.6.27-rc2) using "debugpat" kernel option and provide dmesg
output plus contents of <debugfs>/x86/pat_memtype_list?


Thanks,

Andreas


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