[Bug 178221] New: radeon performance drop from 4.8 to 4.9-rc1 in Shadow of Mordor

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=178221

            Bug ID: 178221
           Summary: radeon performance drop from 4.8 to 4.9-rc1 in Shadow
                    of Mordor
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.9-RC1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: christiannissen at gmx.de
        Regression: No

Created attachment 241881
  --> https://bugzilla.kernel.org/attachment.cgi?id=241881&action=edit
glxinfo output

Hello,

I have a Radeon HD7950 and use Kubuntu 16.04 with Kernel 4.8 and padoka ppa
(for mesa) to play Shadow of Mordor. I just tried out the 4.9-rc1 and noticed a
significant performance drop in the built in benchmark.

Kernel; Resolution; Details Setting; Min FPS; Avg FPS; Max FPS
4.8; FullHD; Very High; 21,37; 37,29; 64,47
4.8; FullHD; Lowest; 27,42; 48,70; 86,77
4.8; 384x216; Very High; 20,30; 39,66; 73,23
4.8; 384x216; Lowest; 27,14; 50,30; 87,34
4.9; FullHD; Very High; 15,15; 29,59; 59,51
4.9; FullHD; Lowest; 26,00; 39,20; 67,31
4.9; 384x216; Very High; 14,94; 30,33; 58,00
4.9; 384x216; Lowest; 22,07; 37,98; 70,93

4.8.1 seems fine as well, but I only tested FullHD / Very High getting the same
results as with 4.8.

All runs used:
- mesa (1:12.1~git161016172400.c61eb3c~y~padoka0)
- libdrm (2.4.71+git1610081859.a44c9c3~x~padoka0)


I build the 4.9-rc1 kernel as described on
https://wiki.ubuntu.com/KernelTeam/GitKernelBuild 

If it helps I could try to bisect the kernel but that might take a few days
(maybe even a week or two) depending on how much free time I have.

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