[REGRESSION][BISECTED] 58a261bfc967: choppy GPU performance

[Deucher, Alexander]

[Public]

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Leo Li
> Sent: Tuesday, October 1, 2024 4:07 PM
> To: Limonciello, Mario <Mario.Limonciello at amd.com>; John Rowley
> <lkml at johnrowley.me>; Mahfooz, Hamza <Hamza.Mahfooz at amd.com>
> Cc: Wentland, Harry <Harry.Wentland at amd.com>; Siqueira, Rodrigo
> <Rodrigo.Siqueira at amd.com>; amd-gfx at lists.freedesktop.org;
> regressions at lists.linux.dev
> Subject: Re: [REGRESSION][BISECTED] 58a261bfc967: choppy GPU
> performance
>
>
>
>
> On 2024-10-01 15:10, Mario Limonciello wrote:
> > On 10/1/2024 14:09, John Rowley wrote:
> >> I was using power-profiles-daemon version 0.23 in balanced mode.
> >>
> >> I also tested TLP, and vanilla kernel without any power daemons running.
> >> Without any daemons I use the following:
> >>
> >>      energy_performance_preference: balance_power
> >>
> >>      scaling_driver: amd-pstate-epp
> >>
> >>      scaling_governor: powersave
> >>
> >
> > Thanks as long as it can reproduce in 'balanced' mode that should
> > exclude PPD from being the cause and it most likely a pure kernel bug.
> >
>
> I'm curious if you have a PSR supported panel. Does setting
> amdgpu.dcdebugmask=0x10 on your kernel cmdline help? This force disables
> PSR.
>
> Another flag to try is amdgpu.dcdebugmask=0x800, which allows PSR but disables
> idle power optimizations. I wonder if that may be causing extra latency.

For reference, this is also being tracked here:
https://gitlab.freedesktop.org/drm/amd/-/issues/3658

Alex


>
> - Leo