Comment # 12
on bug 105425
from MirceaKitsune
Created attachment 138483 [details]
Output of: watch cat /sys/kernel/debug/dri/0/amdgpu_pm_info
I decided to turn my attention to the last logical thing I can imagine: DPM
(Dynamic Power Management) and the clocks on my video card. The kernel added
support for realtime tuning of the frequencies a while ago, so I was pondering
if the default setup may have led to excess overclocking.
I left a console to watch the file /sys/kernel/debug/dri/0/amdgpu_pm_info which
I understand contains the video card frequencies. The maximum "power level" I
seem to reach is 4, at sclk 101500 and mclk 140000. I'm attaching the peak
output of this file here.
My video card is supposed to run at 1015 MHz (core clock) + 5600 MHz (memory
clock). I don't fully understand how those numbers translate to frequencies,
but from what I heard that represents the MHz * 100. If such is the case, my
GPU clock is just right whereas my VRAM is actually under-clocked to a quarter
of its default frequency! Can anyone confirm this so at least the hypothesis of
bad clocks is out of the way?
I may try testing with the kernel parameters "radeon.dpm=0 amdgpu.dpm=0" later:
I tried doing so briefly but the performance is too horrible to play a game, so
I'll instead leave a bot match running in spectator mode while I'm away.
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