[Bug 201843] New: Micro-stuttering each second on amdgpu only on 2560x1440

[b***@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201843

Bug ID: 201843
Summary: Micro-stuttering each second on amdgpu only on
2560x1440
Product: Drivers
Version: 2.5
Kernel Version: 4.19.2-arch1-1-ARCH
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-***@kernel-bugs.osdl.org
Reporter: ***@yandex.ru
Regression: No

Created attachment 279797
--> https://bugzilla.kernel.org/attachment.cgi?id=279797&action=edit
GPU stutter visualized - DOOM

Hello, it's me again.

I notice that in many games if I play on my native screen resolution
(2560x1440) the games always have micro-stutter. If I switch to 1920x1080 it is
resolved.

Facts:
- The micro-stutter doesn't show up right after launch, you have to play a bit
for it to start
- If I set power_dpm_force_performance_level to low and then to high/auto again
the micro-stutter disappears and then gradually accumulates again
- I always play with window compositing disabled (KDE)

Hardware info:
System: Kernel: 4.19.2-arch1-1-ARCH x86_64 bits: 64 compiler: gcc v: 8.2.1
Desktop: KDE Plasma 5.14.4 Distro: Arch Linux
Machine: Type: Desktop Mobo: ASRock model: X370 Gaming K4 UEFI: American
Megatrends
v: P4.70 date: 04/18/2018
CPU: Topology: 8-Core model: AMD Ryzen 7 1700X bits: 64 type: MT MCP
arch: Zen rev: 1 L2 cache: 4096 KiB
flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
bogomips: 108626
Speed: 1960 MHz min/max: 2200/3400 MHz Core speeds (MHz): 1: 1943 2:
1966 3: 3270 4: 3224 5: 2247
6: 2317 7: 3084 8: 3224 9: 3447 10: 3390 11: 2669 12: 2669 13: 3194
14: 3067 15: 3220 16: 3329
Graphics: Device-1: Advanced Micro Devices [AMD/ATI] Ellesmere [Radeon RX
470/480/570/570X/580/580X]
driver: amdgpu v: kernel bus ID: 26:00.0
Display: x11 server: X.Org 1.20.3 driver: modesetting unloaded:
fbdev,vesa
resolution: 2560x1440~60Hz
OpenGL: renderer: AMD Radeon RX 480 Graphics (POLARIS10 DRM 3.27.0
4.19.2-arch1-1-ARCH LLVM 7.0.0)
v: 4.5 Mesa 18.2.5 direct render: Yes
Info: Memory: 31.41 GiB used: 12.89 GiB (41.0%)

Misc:

Total Samples:
76167 (6.493KHz)
amdgpu:amdgpu_mm_rreg:
1527 (1527 samples, 2% of total, 130.2Hz)
amdgpu:amdgpu_mm_wreg:
97 (97 samples, 0.127% of total, 8.269Hz)
WARNING:
Sampling frequency below 100Hz
amdgpu:amdgpu_iv:
1520 (1520 samples, 2% of total, 129.6Hz)
amdgpu:amdgpu_cs:
2426 (2426 samples, 3.19% of total, 206.8Hz)
amdgpu:amdgpu_cs_ioctl:
1190 (1190 samples, 1.56% of total, 101.4Hz)
amdgpu:amdgpu_vm_bo_mapping:
1.297E+04 (1.297E+04 samples, 17% of total, 1.105KHz)
amdgpu:amdgpu_vm_bo_cs:
1.399E+04 (1.399E+04 samples, 18.4% of total, 1.193KHz)
amdgpu:amdgpu_bo_list_set:
4.126E+04 (4.126E+04 samples, 54.2% of total, 3.518KHz)
amdgpu:amdgpu_cs_bo_status:
1188 (1188 samples, 1.56% of total, 101.3Hz)

[b***@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201843

--- Comment #1 from Oleg Chernovskiy (***@yandex.ru) ---
Created attachment 279799
--> https://bugzilla.kernel.org/attachment.cgi?id=279799&action=edit
No stutter - DOOM 1920x1080

Attacting sample in 1920x1080 without stuttering, same PC, same hardware, same
screen

[b***@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201843

***@hotmail.com changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |***@hotmail.com

--- Comment #2 from ***@hotmail.com ---
You are using old kernel and Mesa and the problem can be in the game, DXVK and
wine. Use 4.20-rc4 or AMD drm-next-4.21-wip kernel and Mesa git. Arch linux has
Mesa git but it is older than Oibaf ppa Mesa. I could not see any difference in
your pictures. You can adjust game settings too. AMD developers have better to
do than react this kind of bug reports.

[b***@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201843

I could not see any difference in your pictures.

Okay, please explain what GPU is doing exactly once per second on the graphs
when I look at nothing but the wall in the game?

AMD developers have better to do than react this kind of bug reports.

You too

You are using old kernel and Mesa and the problem can be in the game, DXVK
and wine.

- I'm not using DXVK
- This bug also affects native games
- I'll retest it on new kernel and mesa if _real_ AMD developers say so

[b***@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201843

Oleg Chernovskiy (***@yandex.ru) changed:

What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |CODE_FIX

--- Comment #4 from Oleg Chernovskiy (***@yandex.ru) ---
Did an upgrade to 4.20 (Alex Deucher branch), Mesa 19 and this is indeed
resolved. Apologies to the previous commenter.