I have stepped upon a problem with NVE6 (GK106) in GpuTest
https://www.geeks3d.com/gputes=
t/ plot3d benchmark that occurs only in plot3d
and nowhere else. There are visible glitches and when left for a longer time
Nouveau seems to crash.
The GPU has 4 profiles:=20
07: core 324 MHz memory 648 MHz
0a: core 324-862 MHz memory 1620 MHz
0d: core 549-1228 MHz memory 6008 MHz
0f: core 549-1228 MHz memory 6008 MHz
The problem occurs when switching re-clocking profile directly from 648 MHz=
to
6008 MHz skipping the 0xA 1620 MHz profile. If gone through 0xA profile
everything works fine.
If the memory re-clocking is disabled, it works fine. If there is 0xF profi=
le
set directly (breaking the benchmark) with memory re-clocking enabled, then=
the
nouveau gets unloaded, and nouveau gets loaded back with memory re-clocking
disabled, when changing re-clocking profiles it still glitches. Which impli=
es
something that breaks this is only touched when the memory re-clocking is
enabled.
I have gone through all nouveau pmu scripts traces, checked every difference
(of the scripts) with Nvidia driver and nothing seemed to affect this probl=
em
that has different values than Nvidia. Actual code which was changing the
values for 0xf profile to be same as Nvidia is here:
https://github.com/mmenzyns/nouveau/tree/linux-5.2_gk106_memory_iss=
ues. The
scripts for the highest-profile should be almost identical between Nvidia a=
nd
Nouveau.