Retroarch 1.7.5 causing FPS drops for CPS 3 games
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My pi3b+ underclocked to 1200 (for this test with SF3) was getting dips as low as 57fps for a fully updated retropie 4.4 with binaries of lr-fbalpha and Retroarch 1.7.5. No change when using 1.7.3.
I dug out my original pi3 to re-test. Official Retropie 4.4 stock image. No updates. Stock speeds with crtpi shader at 1080p output res.SF3 Third Strike.
Included binaries of lr-fbalpha 2.97.42 with Retroarch 1.7.1:
60fps some of the time with dips as low as 59.5-59.7fps some of the time.lr-fbalpha 2.97.42 with Retroarch 1.7.5:
60fps most of the time with dips as low as 59.7 maybe once or twice per round. Performs better.Updated binary of lr-fbalpha 2.97.43 with Retroarch 1.7.5:
Bingo. 55-58fps. Scratchy audio. It's the emulator. Maybe @barbudreadmon can shed a light at the situation. -
@Darksavior said in Retroarch 1.7.5 causing FPS drops for CPS 3 games:
My pi3b+ underclocked to 1200 (for this test with SF3) was getting dips as low as 57fps for a fully updated retropie 4.4 with binaries of lr-fbalpha and Retroarch 1.7.5. No change when using 1.7.3.
I dug out my original pi3 to re-test. Official Retropie 4.4 stock image. No updates. Stock speeds with crtpi shader at 1080p output res.SF3 Third Strike.
Included binaries of lr-fbalpha 2.97.42 with Retroarch 1.7.1:
60fps some of the time with dips as low as 59.5-59.7fps some of the time.lr-fbalpha 2.97.42 with Retroarch 1.7.5:
60fps most of the time with dips as low as 59.7 maybe once or twice per round. Performs better.Updated binary of lr-fbalpha 2.97.43 with Retroarch 1.7.5:
Bingo. 55-58fps. Scratchy audio. It's the emulator. Maybe @barbudreadmon can shed a light at the situation.Pretty much my situation, don't know why the audio gets so bad.
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@RedBatman If fps drops below 60 in any game then expect scratchy audio. The situation is the performance of fba, with at least the cps3 driver, got a huge slowdown with the latest version.
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Hmm so is there any way to roll back the update or is there going to be a fix eventually? CPS3 are some of my favorite arcade games.
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@RedBatman No idea if it'll be fixed. Post the issue on fba's github. You can extract .42 from the official premade image.
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When an emulator improves sometimes it comes with a cost of speed. Other times its speed up hacks accidentally removed. Retropie runs on more than a pi.
If this problems exists on more powerful machines it would be a problem at that point.
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Hi I just wanted to say I found a fix. I downloaded Ir-fba-alpha2012. Once I used this my CPS3 games were back to 60fps with no audio stutters or anything. So just to let this be known that if FBA 2.97.43 ever gets fixed again or its still causing issues then FBA 2012 is now needed for CPS3 games now for raspberry pi users.
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@grant2258 Yes, that's what I experienced with the 4player Konami games. I need to use fba2012 for my pi2 (when I was using it). Still, I'd like a definitive answer if the cps3 problem is a mistake, or just emulation accuracy making it slower.
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I only use that core havent looked at the code base to be honest just check the history in the cps3 driver in github to see the recent changes here.
https://github.com/libretro/fbalpha/commits/master/src/burn/drv/cps3/cps3run.cpp
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you could try revert d313472bf07332ee429a80f906252dca348975e5 commit compile and see how it runs
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@grant2258 No idea how to do that.
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@grant2258 said in Retroarch 1.7.5 causing FPS drops for CPS 3 games:
you could try revert d313472bf07332ee429a80f906252dca348975e5 commit compile and see how it runs
I don't know how to do that either. But if FBA 2012 works good still then I'm fine with it, just as long as the current fba doesn't get any worse.
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There's a way to revert to an older version of Retroarch?
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@RedBatman A new version is available. Is the issue still there ?
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I retested using lr-fbalpha 2.97.44 from source. No change. To compare the differences to .42, using my pi3b+ overclocked to 1450, it runs as fast as a stock pi3 non + used to run at which is 60fps most of the time with dips of ~59.5-.7.
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Ok, i didn't know about the speed regression. There was indeed a huge CPS3 patch a few weeks ago to fix some bugs (it was mostly for jojoba actually, until very recently the combo meter in this game wasn't working properly in any emulator, see https://mamedev.emulab.it/haze/2018/10/02/little-changes-part-2/ for the news). I'll look if something can be done about it, however i won't revert a fixed code to a buggy code, as far as i understand this bug is not even happening if you own a rpi3b+ or if you overclock your rpi3...
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Pi3b nonplus at 1300 with SF3:
.44 from source using default compile: Supers drop to ~58.x fps.
.44 from source using altered compile settings: Supers drop to ~59.xfps.I believe this is the part that helps but I'll post the patches link for
system.sh. I basically added all the green text and removed the red text. I replaced -O2 with -O3. YMMV. Supposedly -O3 " there's known issues in GCC 6.3.0 with some of the optimizations it enables."
+ __default_cflags="-O3 -march=armv8-a+crc -mtune=cortex-a53 -mfpu=neon-fp-armv8 -mfloat-abi=hard -ftree-vectorize -funsafe-math-optimizations -funroll-loops -funswitch-loops"https://gist.github.com/GrieverV/b3d1a8e2c23c295b802f9e33286437c6
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@Darksavior except if retropie build script is totally ignoring my fbalpha makefile, i think the relevant part in what you wrote is
-funroll-loops -funswitch-loops:-ftree-vectorizeis included in-O3, which is the fbalpha default- afaik
-funsafe-math-optimizationsshould only have an impact on games using a lot of arythmetic function, it shouldn't be the case for cps3 (on a sidenote, raiden2 uses them a lot)
Thanks for the information, i'll do some tests and if those flags are interesting speed-wise, i'll add them to default fbalpha cflags.
Edit : actually
-funswitch-loopsis also part of-O3, meaning only-funroll-loopsis relevant.
Edit2 : i've been thinking for some time that this change is the culprit, so having a speedup with-funroll-loopsmakes a lot of sense actually. -
Do you guys have rewind disabled for cps3 ? While it was kinda ok to let it enabled previously, recent updates won't allow it anymore speedwise.
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@barbudreadmon It's disabled by default so it's not enabled for me.
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