[Bug 108330] WarThunder game performance killed after Ryzen optimisations

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=108330

            Bug ID: 108330
           Summary: WarThunder game performance killed after Ryzen
                    optimisations
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: acelists@atlas.sk
        QA Contact: dri-devel@lists.freedesktop.org

After the recent optimisation of radeonsi for Ryzen CPUs (apparently change in
thread management distributing them to CPU cores), the performance of the
WarThunder game dived radically.

Normally it was 40-60FPS. After the change it appears OK when in plain fields,
but when moving the vehicle into a more intensive area, where shots are fired
or other player vehicles are around, the FPS drops to 0-10 with really
noticeable freezes and stuttering. This was never the case before the change,

The GPU is Radeon RX 560 (4GB memory).

The CPU is AMD Threadripper 1920x (12 cores/24 threads) so it may be one where
the optimisations are applied. Are Threadripper CCX/core layout properly
recognized by the patch for Ryzen?

Before the patch I noticed, the speed of the game can be visibly negatively
affected if other tasks are running on the CPU. So I always run the game with
no other CPU heavy tasks running. The report is also with no other tasks. It
may be the change of thread scheduling from the patch has now invoked the
core/thread load scenario the game is sensitive to.

I run Mesa from git so I noticed this problem when it was merged.

Now running on Mesa 18.2.2 stable and the problem is not there.

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