[Bug 112124] Kingdom Come: Deliverance (DXVK) - kernel performance regression [Navi] [RADV/ACO]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112124

            Bug ID: 112124
           Summary: Kingdom Come: Deliverance (DXVK) - kernel performance
                    regression [Navi] [RADV/ACO]
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: asheldon55 at gmail.com

Kingdom Come: Deliverance (DXVK) has regressed in performance due to the
following kernel commit, with aco-navi:

commit 828d6fde7f574d74b0a6a591345d3c42b62d5e21
Author: Tianci.Yin <tianci.yin at amd.com>
Date:   Mon Aug 19 15:30:22 2019 +0800

    drm/amdgpu/psp: move TMR to cpu invisible vram region

    so that more visible vram can be available for umd.

    Reviewed-by: Christian König <christian.koenig at amd.com>.
    Signed-off-by: Tianci.Yin <tianci.yin at amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

With 828d6fde7f57 (62 fps/79% GPU usage):

https://camo.githubusercontent.com/4608d45738a5174f64daee0604d9f5d7146aee68/68747470733a2f2f692e696d6775722e636f6d2f757356306d33412e6a7067

With 828d6fde7f57 reverted (79 fps, 100% GPU usage):
https://camo.githubusercontent.com/77a505f85b75db0d2062aa4d8319b6007ba524fe/68747470733a2f2f692e696d6775722e636f6d2f394366695270452e6a7067

Tests were with aco-navi branch:
https://gitlab.freedesktop.org/Venemo/mesa/tree/aco-navi

Performance with LLVM is comparable with the commit reverted or not, however.
Slightly better with the commit since GPU usage is lower for the same
performance:

With 828d6fde7f57 (61.4 fps/88% GPU usage):
https://i.imgur.com/kJgvRbq.jpg

Without 8d6fde7f57 (61.2 fps/100% GPU usage):
https://i.imgur.com/AemAss1.jpg

System:

linux-5.4-rc4 (also tested amd-staging-drm-next)
Mesa aco-navi (e641024) and Mesa git (8dadef2ec54)
MSI Evoke 5700 XT

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