[Regression] MGS: Peace Walker HD Slows up to about half the normal fps after a couple minutes in (#15714)

[hikagura99]

Quick summary

When playing Metal Gear Solid: Peace Walker HD, european standalone release NPEB00686, after a couple minutes ingame the framerate drops from 30 to 13, and sometimes even to 8.

Details

I tried with both the suggested settings on the wiki page, with manual tinkering and with default options. The only one I tried not to use is the uncapped framerate since my pc can't run it at that speed. I already played for a couple hours before this happened and had no problems whatsoever. It started to appear after I encountered a foggy area, if it could help

Attach a log file

RPCS3.log

Attach capture files for visual issues

No response

System configuration

OS: Arch Linux x86_64
Host: HP 255 G8 Notebook PC
Kernel: 6.10.1-zen1-1-zen
CPU: AMD Ryzen 5 5500U with Radeon Graphics (12) @ 4.056GHz
GPU: AMD ATI 04:00.0 Lucienne with vulkan-radeon
Memory: 15295MiB

Other details

No response

[ReLyf47]

finally someone that has this issue posted an issue on github

can you try and do a regression testing
people say This build (rpcs3-v0.0.32-16597-461862be) works fine

now what i want you to do is try to find which build causes the slow down issue

[ReLyf47]

i have tried to make a regression post but couldnt manage to reproduce the issue myself

[kd-11]

Enable emulator basic stats and advanced stats (if the slowdown is from GPU emulation). Debug -> "Debug Overlay" enable. This requires enabling the debug menu or modifying configuration file manually.
My guess is whatever IGP is in use has very low dedicated "VRAM" and after going through a region with intense effects the memory is spilling a lot. Changing dedicated VRAM to 2GB in BIOS may fix it.

[hikagura99]

Aur Compiled git package in which i first discovered the bug: 0.0.32-16711
Oldest official appimage in which i found the same bug: 0.0.32-16617
Last official appimage in which the bug seems to not appear: 0.0.32-16614
Same workstation stated in the post.

It usually takes between 1 and 2 minutes for the bug to happen, sometimes a bit more. To make it happen I'm listening to the briefing files before starting a mission. If going through a load screen, it stops for a couple seconds, then it happens again. Even with the 60fps setting on, it drops between 8 and 14 fps.

In reply to @kd-11, i don't think that's the reason, since it happens in low stress points of the game as well (i.e. the aforementioned briefing files menu in which there's only audio playing and a moving background of a cassette tape turning).

Log of the last working version

Log of the first bugged version

I think that's all, if there's anything else I could do feel free to ask

[kd-11]

In that case, this is a SPU regression caused by #15714

[hikagura99]

will i get a notification when this is gonna be fixed?

[AniLeo]

Can you test #15897?

[hikagura99]

Can you test #15897?

It seems to be working