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

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Date:	Mon, 04 May 2009 17:07:40 +0200
From:	Michel Dänzer <michel@...nzer.net>
To:	Karsten Mehrhoff <kawime@....de>
Cc:	Shaohua Li <shaohua.li@...el.com>, Dave Airlie <airlied@...ux.ie>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>,
	"stable@...nel.org" <stable@...nel.org>
Subject: Re: PROBLEM: 2.6.29.2 - AGP doesn't work anymore on my nforce2

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 <kawime@....de> 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


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer
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