Weird framerate drop when re-launching DXVK games/applications with FreeSync about dxvk

[mbriar]

Maybe post a screenshot with DXVK_HUD=full when a game is running slow.

Unigine Superposition Benchmark, Fallout 4, Borderlands 1 and 3, Elden Ring

Elden Ring is d3d12 and doesn't use DXVK, this issue sounds not something DXVK has any control over anyways.

[definitelyuncertain]

This is what the HUD shows when Fallout 4 is running slow:

This is full speed:

Apparently Elden Ring does have a DX11 launcher which runs DXVK, but you're right that the main game is DX12 which shouldn't be affected. And I think I misremember for Borderlands 3 as well which is DX12.

Not sure what's going on here, but DXVK seems to be the only affected library. I'll try out some more apps and check back.

[mbriar]

Do you see any difference in GPU and VRAM clocks between slow and fast? Some strange amdgpu power management issue would be the best guess i have.

[definitelyuncertain]

I ran it with MangoHud to get the clock info:

Fast:

Slow:

It does look like the GPU clock is running slower, and the power consumption is also lower. However, changing the power settings using CoreCtrl has no effect (I didn't run CoreCtrl for the previous tests).

I ran GravityMark and Doom (2016) demo (OpenGL) on Proton, and both are unaffected. Also did a full system upgrade with similar results.

PS: Disabling FreeSync altogether in Xorg config doesn't help either.

[mbriar]

However, changing the power settings using CoreCtrl has no effect

Even if you do something like echo profile_peak > /sys/class/drm/card0/device/power_dpm_force_performance_level?

[ranplayer]

@definitelyuncertain what's your kernel version ? I'm not sure that is your case, but I've seen performance and freesync issues with kernels higher than 6.1. There is an open issue on the amdgpu gitlab -> https://gitlab.freedesktop.org/drm/amd/-/issues/2966

[definitelyuncertain]

@mbriar That doesn't help (both with and without CoreCtrl), though it does add a few Hz, so thanks for the tip! :-)

@ranplayer it's 6.8.9-arch1-2.1 (the latest Arch update). I'll try booting Ubuntu 22.04 with an older kernel to see if that helps.

[doitsujin]

FWIW I'm on a similar setup (on paper anyway, Plasma 6 Wayland, arch, same mesa, 144hz display with VRR enabled, 6.8 kernel) and haven't had any issues with this ever. Not sure what could be going wrong at this point but nothing here is weird or expected to be broken.

Maybe try this branch, it just disables synchronizing with presentation to meet the frame latency goals provided by the app and is like the only thing that may be a bit janky in some environments, if it's not that then I'm out of ideas.

[definitelyuncertain]

I booted Ubuntu 22.04 with an older kernel (5.19.something), and while it didn't fix this issue, it fixed the DX12 issues with Elden Ring which is now running quite well with no other changes. Thanks @ranplayer for the suggestion!

Given all this, it seems like there is a regression in the Kernel, Mesa, and/or Wine affecting DX12, but there's also a separate DXVK issue.

@doitsujin I'm setting up the build for your branch. Will check back once I've tried it.

[definitelyuncertain]

@doitsujin FYI I'm getting a page fault with that branch (it works as expected when I build the master)

[doitsujin]

yeah i didn't test that build at all, but normally disabling extensions should really just work so not sure what's going on.