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

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Comment # 3 on bug 95474 from
(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.


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