Created attachment 121737 [details] Xorg.log I just installed ubuntu 15.10 (with oibaf and commendsarnex ppa to see how good is my radeon hd4770 (rv740) works with fresh graphics stack). Unigine Valley-1.0 (native) and MafiaII Game (wine with Gallium Nine) was used to see video performance differences against windows7. Linux Unigine Valley Benchmark 1.0: FPS: 8.5 Score: 356 Min FPS:4.2 Max FPS:13.8 Windows7 Unigine Valley Benchmark 1.0 (dx11 render, as opengl wasn`t able to run): FPS: 15.9 Score: 666 Min FPS:9.2 Max FPS:29.5 Linux Mafia2 Game (internal benchmark) under wine with Gallium Nine, dri3): 22.2fps Windows7 Mafia2 Game(internal benchmark) under wine with Gallium Nine, dri3): 42.4fps It works (without visible artifacts) and it is great!, but it is almost twice as slow against windows. There are some benchmarks on phoronix (http://www.phoronix.com/scan.php?page=article&item=radeon_1404_win81&num=3) for more recent and powerfull r600g hw, and there was no such big differences there. So is it r700 classs hw works slow with gallium in general, or it something wrong with just rv740 support? (or something else ...?)
Created attachment 121738 [details] dmesg
The open source Linux driver has not been as optimized as the windows driver.
yes, but my quastion: is it optimized for rv740 not less than for other chips supported by r600g (for some reasons, bugs, etc..)? performance difference at first sight seems too big.
I think the answer is "not knowingly". Optimizations tend to be done for an entire generation (or a few generations), not for specific chips. That said, if a specific chip is observed to be an outlier (performance quite a bit lower or higher than expected) then that specific discrepancy will probably get some attention. I don't understand your Mafia2 numbers - the Linux version wouldn't be running under Nine, would it ? If the Linux version were running under OpenGL, then this would look like a fairly typical "DX renderer in the app gets a lot more work than the GL renderer" scenario.
I will try to find different card from r600g driver for compare at the same conditions. Mafia2 works winth Nine :), without it - 15.8 fps.
HD4850 results: Linux Unigine Valley Benchmark 1.0: FPS: 10.2 Score: 428 Min FPS:4.2 Max FPS:19.3 Windows7 Unigine Valley Benchmark 1.0 (dx11 render): FPS: 16.9 Score: 709 Min FPS:10.3 Max FPS:33.1 Linux Mafia2 Game (internal benchmark) under wine with Gallium Nine, dri3): 25fps Windows7 Mafia2 Game(internal benchmark): 42.7fps Not much differences.
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