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: 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: 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 _______________________________________________ Intel-gfx mailing list Intel-gfx at lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx at lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
