since commit http://cgit.freedesktop.org/mesa/mesa/commit/?id=d6eb4321d0e62b6b391ad88ce390bd6e23d79747 gputest pixmark_volplosion is slower about 45% As far i know it's olny one app affected, other tests run ok. I've bisected&checked it only for radeonsi. I can test nv50 and gma4500 but i have to install 64bit system, so i need more time.
9600gt has got almost 45% performance drop GMA4500 doesn't run, gpu crashes in both cases
When I wrote this patch series I checked on shader-db and there were no differences on i965 hardware. So I'm guessing this is due to an unantipicated difference in how code generation works with the Radeon back end. Arek, would it be possible to find a shader from pixmark_volplosion that compiles to worse code after the patch, and upload both the shader source and the resulting Radeon assembly code (both before and after)? That would be very helpful to me in figuring out what is going wrong. Thanks.
Paul thanks for answer, it looks like gallium3d is involved (nouveau/9600GT) Don't get me wrong but i don't know how it works, i even don't really know what shaders are. Do I find single shader that damage code? I don't know what/how is looking for. But if you don't busy to much and have a lot of patience i can try. I can do some dumps with mesa_glsl=dump or r600_debug=ps,pv.
Created attachment 90724 [details] mesa_glsl dump/llvmpipe/good performance head set to 9d2951ea0acdcd219ad28831ac9e7112737d9ca3 OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.5, 128 bits) gputest score: 8
Created attachment 90725 [details] mesa_glsl dump/llvmpipe/worse performance head set to d6eb4321d0e62b6b391ad88ce390bd6e23d79747 OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.5, 128 bits) gputest score: 5
I'm not 100% sure this is actually fixed but I made a number of improvements to the GLSL IR unrolling code recently so I'm resolving this as fixed. It's not really straight forward to compare Mesa versions with the amount of time that has passed, and bugzilla doesn't have an obsolete option.
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