[Linux] Weird lag spikes for no reason

[t0mtee]

I'm running:

• Debian 12
• KDE Plasma 5.27.5
• Wayland, but also happens on X11 (more noticeable as I can uncap FPS) And my specs are:
• Ryzen 5 5600
• RX 6700 XT
• 32 GiB RAM log.txt Here's a frametime graph - I am simply standing still, there's no shader compilation or anything, but my FPS will go from 70 to 40 and then back up to 70 after a few seconds for seemingly no reason.

I built Cemu myself on commit bab1616 with this script.

[Squall-Leonhart]

Turn off SAM and retest, there are odd performance issues with it in current drivers.

[t0mtee]

Thanks for the response! The issue still happens with SAM disabled (I disabled Above 4G Decoding and Resizable Bar in BIOS) and after disabling all optimizations in my build script.

[t0mtee]

Also happens on AppImage

[t0mtee]

Continues to happen with all mods except FPS++ disabled - I've tried all the frame average and fence type options, it continues to happen

[t0mtee]

Happens outside too

I have:

• Verified my game installation (the DLC and Update was corrupted but I have fixed that)
• Tried using both RADV and AMDVLK, no difference (at least I'm 90% sure I set up AMDVLK correctly. Mangohud says I was using Mesa but using the same ENV variable in Yuzu, Yuzu itself tells me It's using AMDVLK instead of RADV, so I used the same ENV variable for Cemu so it should have used AMDVLK)

[menguele]

This is probably not caused by CEMU, test in another heavy game, be it within CEMU or native/Proton/Wine with uncapped FPS and see if the same occurs, or see if disabling FPS++ resolves the issue.