Bug#790663: Extremely slow window dragging and very poor performance with KMS activated on RV100/M6 [Rage/Radeon Mobility Series]

[Michel Dänzer]

On 03.07.2015 02:42, Alfonso García wrote:
> On 02/07/15, Michel Dänzer wrote:
>> On 02.07.2015 01:39, Alfonso García wrote:
>>> On 01/07/15, Michel Dänzer wrote:
>>>> On 01.07.2015 01:44, alfon wrote:
>>>>>
>> Can you try if a simple compositing manager (e.g. xcompmgr -a) helps
>> with the problem (with the options below commented out)?
> 
> I probed this program and really improved the window manager performance
> with the Xorg accel option and with the options you say commented out
> 
> In return performance like mpv is now worse (the movement blinks and still
> shots are slow)
> 
>>
>>>>> 	Option          "EXAVSync"              "on"
>>>> [...]
>>>>> 	Option 		"ColorTiling"		"off"
>>>>> 	Option 		"ColorTiling2D" 	"off"
>>>>> 	Option          "EXAPixmaps"            "on"
>>>>
>>>> Does commenting out these options help?
>>>>
>>>
>>> No,
>>
>> Please provide /var/log/Xorg.0.log corresponding to commenting out
>> everything I recommended in xorg.conf.
> 
> I attached the Xorg log file with the suggested configuration and running
> xcompmgr -c

Note that I suggested xcompmgr -a, which should be lighter than -c.


> [  2331.952] (**) Option "AIGLX" "on"
> [  2331.952] (**) Option "DRI2" "on"
[...]
> [  2332.078] (**) ModulePath set to "/usr/lib/xorg/modules"
> [  2332.078] (**) Extension "Composite" is enabled
[...]
> [  2332.223] (**) RADEON(0): Depth 24, (--) framebuffer bpp 32
[...]
> [  2332.224] (**) RADEON(0): Option "Accel" "on"
> [  2332.224] (**) RADEON(0): Option "EnablePageFlip" "on"
[...]
> [  2332.224] (**) RADEON(0): Option "AccelMethod" "EXA"
> [  2332.224] (**) RADEON(0): Option "ZaphodHeads" "LVDS,VGA-0"

These are all defaults, no need to specify them explicitly in xorg.conf.


> [  2332.224] (**) RADEON(0): Option "RenderAccel" "off"

I missed this before. Why did you disable this? Does not disabling it help?


> [  2363.450] (II) RADEON(0): Allocate new frame buffer 1920x1080 stride 1920
> [  2363.508] (II) RADEON(0): VRAM usage limit set to 5371K
[...]
> [  3099.062] Not enough RAM to hw accel xv operation

This is probably why mpv isn't working well. Any chance you can try if
the attached xf86-video-ati patch helps for this?

Note that you can always use mpv -vo x11 to get basically the same video
experience as with Option "NoAccel".


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer
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