dri + ATI: dramatic performance slowdown

Ronald Klop ronald-freebsd8 at klop.yi.org
Tue Apr 21 08:26:35 UTC 2009

On Mon, 20 Apr 2009 15:26:20 +0200, Oliver Lehmann <lehmann at ans-netz.de>  

> Hi,
> as I found out in the meantime - the following described problem can be
> only worked around when 'Load   "dri"' is removed from the server
> section, and 'Option     "DRI"   "true"' is removed from the Device
> section. Otherwise:
> I've synced my pre-drm-changes 7-STABLE to the latest 7-STABLE. Now the
> grafic performance in xorg decreased dramatically. Moving a window or
> resizing a window makes me feel sent back 15 years ago ;). I can "see"  
> the
> window resizing. The popup of an window is fast, but moving it around or
> scrolling... jesus that is what I call slow. Firefox is nearly not usable
> for example :(
> I wonder what is causing this. I'm using a ATI Radeon HD3850 in it's AGP
> version (probably kinda uncommon).
> olivleh1 at kartoffel olivleh1> dmesg | grep drm
> drm0: <ATI Radeon HD3850> on vgapci0
> vgapci0: child drm0 requested pci_enable_busmaster
> info: [drm] AGP at 0xd8000000 128MB
> info: [drm] Initialized radeon 1.29.0 20080528
> info: [drm] Setting GART location based on new memory map
> info: [drm] Loading RV670 CP Microcode
> info: [drm] Loading RV670 PFP Microcode
> info: [drm] Resetting GPU
> info: [drm] writeback test succeeded in 1 usecs
> drm0: [ITHREAD]
> olivleh1 at kartoffel olivleh1> pkg_info | grep radeon
> xf86-video-radeonhd-1.2.5 X.Org ati RadeonHD display driver
> olivleh1 at kartoffel olivleh1>
>> From my xorg.conf:
> Section "Module"
>     Load        "dbe"
>     Load        "freetype"
>     Load        "glx"
>     Load        "dri"
> EndSection
> Section "Device"
>     Identifier	"ATI1"
>     BoardName	"ATI Radeon"
>     Driver      "radeonhd"
>     BusID	"PCI:1:0:0"
>     Option      "Monitor-DVI-I_1/digital"  "Syncmaster DVI1"
>     Option      "Monitor-DVI-I_2/digital"  "Syncmaster DVI2"
>     Option	"DRI"	"true"
> EndSection
> the whole xorg.conf can be found here:
> http://cvs.olli.homeip.net/index.html/configs/xorg.conf?rev=1.9
> Is this expected to happen with DRI enabled?


X.org is quite good in autodetecting your hardware and running without a  
config. It works for me out-of-the-box with my Radeon HD 2400 XT and  
Radeon HD 2600 XT. (But I'm not using agp.)
You can also try the xf86-video-ati driver. It works very well with 2d  
accell. (I'm using it also.)


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