Slowdown on PS1 games

[Ka]

@mitu Thanks. I've just tried that and switched to mode 1 above (1920x1080@60hz), but unfortunately it didn't change anything. After a quick race on GT2, the in-game timer read 3 minutes 12, whereas my stopwatch read 3 minutes 40.

[dankcushions]

@Ka
you're using a shader?

[INFO] [Shaders]: Specific shader preset found at /home/pi/.config/retroarch/config/PCSX-ReARMed/PCSX-ReARMed.glslp.
[INFO] [Shaders]: core-specific shader preset found.

turn it off please, and then lets see a new verbose log and see if you're still dropping frames.

[ClassicGMR]

@windg said in Slowdown on PS1 games:

I have play Gran Turismo 1&2 on a Pi3 without slowdowns.

If you have enable enchanced resolution try to disable. Disable also the vibration from RetroArch menu. Do you have a psx bios file in the system folder?

@Ka you didn't mention if you also turned off vibration or if your BIOS is accurate. These are important as well that's why windg brought them up. :)

[Ka]

@ClassicGMR Sorry - forgot to mention that vibration on my pad is turned off. How would I know if my bios is accurate?

[ClassicGMR]

@Ka said in Slowdown on PS1 games:

@ClassicGMR Sorry - forgot to mention that vibration on my pad is turned off. How would I know if my bios is accurate?

just checking. Vibration was killing my emulation experience. :)

The BIOS and accepted hashes are found in the docs. Depending on which emulator making sure your BIOS is named properly (case sensitive) is also important.

https://retropie.org.uk/docs/Playstation-1/#bios

[Ka]

@dankcushions Thanks. Shaders are off. Please see below for log:

https://pastebin.com/4WWN74w5

[Ka]

@ClassicGMR Thanks. I've made sure the bios files are all named according to the documentation, and that all the listed bios files are in the RetroPie/bios folder.

Would it make a difference if there are any other bios files there? I seem to have quite a few for some reason.

[dankcushions]

thanks - that looks good to me - you're hardly dropping frames:

[INFO] Threaded video stats: Frames pushed: 19121, Frames dropped: 3.

secondly, please upload /opt/retropie/configs/all/retroarch-core-options.cfg

[Ka]

@dankcushions Will do. Removing the shader didn't seem to improve things in terms of slowdown, and neither did making sure the bios names matched the documentation unfortunately. I'll add the .cfg file when I get a moment.

[dankcushions]

@Ka i suspect this will turn out to be an emulation bug that is only fixed by using interpreter rather than dynarec, or just a better PSX emulator (pcsx rearmed isn't perfect). I get similar pacing bugs with tekken 3 - the speed is ever so slightly off at times, but i wouldn't notice it if i wasn't very familiar with that game. racing games are probably more obvious due to their nature.

[Ka]

@dankcushions Cheers, here you go: https://pastebin.com/8TAj5RSX

It makes sense that it's more obvious in racing games, and yeah, I've played shedloads of Wipeout and Gran Turismo, so it probably seems more obvious to me that something is off.

That said, the slowdown on GT2 and Rage Racer is quite significant - I'd say RR isn't really playable on my setup, it's really noticeably slowing down. But yeah, you'd definitely notice it more in RR than in, say, Tomb Raider.

[windg]

If you can, try the PAL version of Gran Turismo 2 and a lower resolution from raspi-config (1280x720) .

[Ka]

@windg I don't have access to the PAL version of GT2 unfortunately, but I did try running the game at 1280x720, and the slowdown was still present - the in-game timer was about thirty seconds behind the stopwatch after a three minute race.

Presumably it's not down to the game overtaxing the Pi, then...

[dankcushions]

@Ka one thing you could try is raising
the CPU speed core option. there’s some info on this here: https://retropie.org.uk/docs/Playstation-1/#performance-psx-cpu-clock

[Ka]

@dankcushions Thanks - will give that a shot. Daft question from me - should I be raising that figure or lowering it? What does that figure actually do? Presumably I can fiddle around with it in-game without breaking anything.

The documentation says "The clock speed percentage of the emulated PSX hardware's CPU can be adjusted by the user" through this option, and that the default is 57.

That sounds like the emulator defaults to 57% speed of the emulated PSX CPU - is that right? It sounds odd to me. Were PSX CPUs underclocked?

[dankcushions]

@Ka raising, like i said :) i don’t know where the 57 figure comes from or the logic behind it, but that is the figure that seems to be most compatible across all games. if you set it to 100 you’ll get issues i expect, so be sure to set the config per-game as per the link.

[Ka]

@dankcushions OK, cool - much appreciated. I'll give that a try.

[Ka]

@dankcushions said in Slowdown on PS1 games:

@Ka one thing you could try is raising
the CPU speed core option. there’s some info on this here: https://retropie.org.uk/docs/Playstation-1/#performance-psx-cpu-clock

This was a really good call, as it made a HUGE diffference. Wipeout and Rage Racer appear to run at full speed with the CPU clock jacked up to about 70. I pushed it up to 95 at one point, with no apparent ill effects - my trusty stopwatch seemed to indicate that the game was running at the right speed and wasn’t going too fast, and there was no slowdown that I could see.

With Gran Turismo 2, even at 95% there was a tiny bit of slowdown - about two or three seconds over the course of a three minute race, but I couldn’t honestly say that this wasn’t present on original hardware and it’s hard to see how you would notice when actually playing the game and not scrutinising it for speed drops.

So thanks - I can finally play those games properly again!

[windg]

I have complete GT2 and i didn't understand that was slow(my bad), until i set the CPU to 95. Now is running smoother and better. Nice discovery Ka, thanks! Thanks dankcushions too for the suggestion, i will try it with others games that looks slow.

[SgtJimmyRustles]

@Rion Question, what special about that bios?