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

[Zhang, Xiong Y]

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@lists.freedesktop.org 
[mailto:intel-gfx-bounces+xiong.y.zhang=intel@lists.freedesktop.org] On 
Behalf Of Ben Widawsky
Sent: Tuesday, January 22, 2013 1:34 PM
To: mesa-...@lists.freedesktop.org
Cc: intel-gfx@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 witte...@gmail.com
To: intel-gfx@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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Re: [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.zh...@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@lists.freedesktop.org 
 [mailto:intel-gfx-bounces+xiong.y.zhang=intel@lists.freedesktop.org] On 
 Behalf Of Ben Widawsky
 Sent: Tuesday, January 22, 2013 1:34 PM
 To: mesa-...@lists.freedesktop.org
 Cc: intel-gfx@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 witte...@gmail.com
 To: intel-gfx@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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