[Mesa-dev] [Intel-gfx] Fw: Very low performance when streaming textures

[Marcel Witte]

Thanks for your testing. Can you give me any hints why the performance is so bad on my System?

I'm using openSUSE 12.2, Mesa 9.0.1, the latest xf86-video-intel and Kernel 3.7.3

Am Dienstag, 22. Januar 2013 schrieb Zhang, Xiong Y <xiong.y.zhang at intel.com>:
> Using the latest mesa master tree, I test it on my Core i7-2600 : 
> 
> 1)  In default configuration, the monitor's refresh rate is 60FPS, so the test result is 59.3 FPS
> 2)  export vblank_mode = 0, then the test result is 170 FPS.
> I don't see the big difference between using direct transfer or using PBO, the test result almost is the same on these two cases.
> 
> thanks
> 
> -----Original Message-----
> From: intel-gfx-bounces+xiong.y.zhang=intel.com at lists.freedesktop.org [mailto:intel-gfx-bounces+xiong.y.zhang=intel.com at lists.freedesktop.org] On Behalf Of Ben Widawsky
> Sent: Tuesday, January 22, 2013 1:34 PM
> To: mesa-dev at lists.freedesktop.org
> Cc: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] Fw: Very low performance when streaming textures
> 
> mesa-dev is a better place for this question.
> 
> Begin forwarded message:
> 
> Date: Mon, 21 Jan 2013 22:13:34 +0100
> From: Marcel Witte <wittemar at gmail.com>
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] Very low performance when streaming textures
> 
> 
> Hi,
> 
> I'm refering to the example of this article about streaming textures and using Pixel Buffer Objects: http://www.songho.ca/opengl/gl_pbo.html
> 
> The PBO Unpack example
> (http://www.songho.ca/opengl/files/pboUnpack.zip) is creating an "animated texture" and can switch between three modes: Direct transfering of the texture using glTexSubImage2D, and using one or two PBOs for better performance.
> 
> I'm running this example on an notebook with an Intel Core i7-2630QM and an Nvidia Geforce GT 550M with Optimus. If I'm using the Nvidia card using optirun I get the expected high performance, using direct tranfer about 150 fps and using PBOs about 400 fps. But if I'm using the intel card I get really slow rates, about 40 fps in direct mode and even worse about 10 fps using PBOs.
> 
> Running the same example with windows I get about 100 fps using the intel card in every mode.
> 
> Is this expected behaviour or is this a bug in the intel linux driver?
> How can I improve the performance? I hope you can help me here as I'm writing a real application using a video as texture.
> 
> Regards,
> Marcel Witte
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