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

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Message-ID: <48AA9C3B.5030309@keyaccess.nl>
Date:	Tue, 19 Aug 2008 12:11:07 +0200
From:	Rene Herman <rene.herman@...access.nl>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Dave Airlie <airlied@...il.com>, Shaohua Li <shaohua.li@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	dri-users@...ts.sourceforge.net,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: AGP and PAT (induced?) problem (on AMD family 6)

On 15-08-08 17:24, Rene Herman wrote:

> On 15-08-08 16:22, Ingo Molnar wrote:
> 
>> (more people Cc:-ed)
> 
> Thank you. Additional information at http://lkml.org/lkml/2008/8/6/449
> 
>> agreed - +12 seconds wait suggest some rather fundamental breakage.
>> Did we go back to uncached for some critical display area that makes
>> X start up (shut down) that slowly? Did we mark the BIOS uncacheable
>> perhaps, causing X to execute BIOS code very slowly?
> 
> Quite a lot "uncached-minus" in those lists. I am desperately trying to 
> avoid a clue about mostly anything graphics related so, "I dunno".
> 
> I haven't just disabled PAT yet (although I was about to just do so) and 
> am available for testing.

<waiting with bated breath>

Additional observation with respect to first,next shutdown:

With Option "AGPSize" "64", and booted with "nopat", X startup (from 
startx<enter> to functional desktop) is approximately 5 seconds, 
shutdown is 1 second as calibration times.

Booted without "nopat", X startup seems to alternate between 10+ and 16+ 
seconds and for shutdown -- the first shutdown after boot takes some 14 
seconds total, subsequent shutdowns settle at around 5 seconds.

Rene.
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