[Bug 95474] Bioshock Infinite and DiRT Showdown perform very poorly on any GPU with GCN >=1.1

https://bugs.freedesktop.org/show_bug.cgi?id=95474

--- Comment #3 from Jan Ziak 0xe2.0x9a.0x9b@gmail.com --- (In reply to Alex Deucher from comment #2)

Can you identify what component caused the regression? mesa? llvm? kernel?

That is a good question, but I do not know the answer.

Data:

Kernel: 4.6.0 Kernel module: radeon.ko

Resolution: 1920x1080 Game quality setting: Ultra

CPU: A10-7850K CPU utilization: 120% (kernel-space is about 10% CPU)

GPU: R9 390 GPU utilization (radeontop): >>>> 15% <<<< GPU performance level: forced max clocks

Based on this, it seems that the user-space component (mesa + llvm) is the bottleneck.