linux-kernel - Re: PROBLEM: 2.6.29.2 - AGP doesn't work anymore on my nforce2

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Date:	Mon, 18 May 2009 09:50:26 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michel Dänzer <michel@...nzer.net>,
	Karsten Mehrhoff <kawime@....de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	"stable@...nel.org" <stable@...nel.org>,
	Dave Airlie <airlied@...ux.ie>
Subject: Re: PROBLEM: 2.6.29.2 - AGP doesn't work anymore on my nforce2

On Sun, May 17, 2009 at 07:44:20AM +0800, Andrew Morton wrote:
> On Mon, 04 May 2009 18:40:52 +0200 Michel D__nzer <michel@...nzer.net> wrote:
> 
> > On Mon, 2009-05-04 at 18:23 +0200, Karsten Mehrhoff wrote:
> > > On Mon, 04 May 2009 17:07:40 +0200, Michel D__nzer wrote:
> > > > On Mon, 2009-05-04 at 08:31 +0200, Karsten Mehrhoff wrote:
> > > >> On Mon, 04 May 2009 03:41:51 +0200, Shaohua Li wrote:
> > > >>> On Fri, May 01, 2009 at 09:22:19PM +0800, kawime@....de wrote:
> > > >>>>> On Thu, 2009-04-30 at 17:59 -0700, Andrew Morton wrote:
> > > >>>>>> On Thu, 30 Apr 2009 10:51:47 +0200
> > > >>>>>> Karsten Mehrhoff wrote:
> > > >>>>>>
> > > >>>>>>> [1.]
> > > >>>>>>> PROBLEM: No more agp card functionality with the patch 2.6.29.2 of
> > > >>>>>> 'a/drivers/char/agp/generic.c'
> > > >>>>>>>
> > > >>>>>>> [2.]
> > > >>>>>>> I compiled the kernel 2.6.29.2 with my .config of 2.6.29.1 and run
> > > >>>>>> into problems with the speed of my ATI RADEON 9600 (rv350)
> > > >>>>>>>
> > > >>>>>>
> > > >>>>>
> > > >>>>> Is your problem speed issue ? ie just a slowdown ? Or does AGP stop
> > > >>>>> working with this patch ? Slowdown is expected from this patch but
> > > >>>>> it should hurt too much.
> > > >>>>>
> > > >>>>
> > > >>>>                        2.6.29.1  | 2.6.29.2
> > > >>>>                         --------  |  --------
> > > >>>> glxgears             ~ 2900 FPS  |  ~ 75 FPS
> > > >>>> glxgears -fullscreen ~  500 FPS  |  ~ 11 FPS
> > > >>> Does this patch alone give so huge slowdown? From my little knowledge,
> > > >>> xserver
> > > >>> does agp pages allocation only at startup.
> > > >>
> > > >> I only reverted this patch in the source file  
> > > >> (/drivers/char/agp/generic.c) and got back my old speed on 2.6.29.2.
> > > >
> > > > Is the DRI enabled in both cases? Compare the Xorg.0.log file and the
> > > > output of
> > > >
> > > > dmesg|grep -e agp -e drm
> > > >
> > > 
> > > 
> > > *********************************
> > > 2.6.29.2 (original) 
> > > *********************************
> > > 
> > > $ dmesg|grep -e agp -e drm
> > > $ dmesg|grep agp
> > > [    0.861997] Linux agpgart interface v0.103
> > > [   10.893793] agpgart: Detected NVIDIA nForce2 chipset
> > > [   10.939070] agpgart-nvidia 0000:00:00.0: AGP aperture is 64M @ 0xe0000000
> > 
> > No drm lines?
> > 
> > 
> > > $ glxinfo | grep direct
> > > direct rendering: Yes
> > 
> > This is not a sufficient test anymore since swrast_dri.so is direct
> > rendering but not hardware accelerated. Something like
> > 
> > glxinfo|grep render
> > 
> > can be used to verify both direct rendering and hardware acceleration
> > (the latter but not the former is also possible with AIGLX).
> > 
> > 
> > > (EE) RADEON(0): [agp] AGP failed to initialize. Disabling the DRI.
> > 
> > [...]
> > 
> > > For me it seems that agp failed to initialize because of the patch.
> > 
> > Indeed.
> > 
> 
> Guys, can we rev this up again please?
> 
> AFAICT we have two problems and at least one of them is in 2.6.29.x and
> is presumably headed into 2.6.30 as well.
the slowdown Karsten saw is because dri is disabled. I can't image why zero
page will cause such issue. please double check if this is really caused by
59de2bebabc5027f93df999d59cc65df591c3e6e.

Thanks,
Shaohua
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