[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.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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