08704: All sets on dassault.cpp: Games running very slow

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08704	Speed	Major	Always	Jul 7, 2023, 04:28	Jul 10, 2023, 04:57

Tester	Balthier	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	dataeast/dassault.cpp
Version	0.256	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08704: All sets on dassault.cpp: Games running very slow
Description	These games run terribly slow compared to versions prior to 0.253. I barely get 50% speed now, granted I don't have a beefy system but I usually only have problems like this with 3D games or Netlist audio related stuff. If the emulation got better somehow and this is linked to that then by all means close this.
Steps To Reproduce	1. Run any of the affected games and hit F11 to view the speed.
Additional Information
Github Commit

Flags
Regression Version	0.253
Affected Sets / Systems	All sets on dassault.cpp

Attached Files

No.21621 Mamesick Senior Tester Jul 7, 2023, 15:15 edited on: Jul 7, 2023, 15:15	I would say confirmed, because this change seems to be really CPU demanding with the new 68000 core that was introduced around 0.253 if I'm not wrong: // config.set_maximum_quantum(attotime::from_hz(8400)); // 140 CPU slices per frame config.set_perfect_quantum(m_maincpu); // I was seeing random lockups.. let's see if this helps Though it's correct emulation, so I don't want to change the status of the bug to confirmed. Developers surely can say more on this.
No.21639 Osso Moderator Jul 10, 2023, 04:57	I agree with Mamesick that this isn't a bug, per se. Emulation speed is dragged down because this requires 'perfect' synch between the two M68000s. Short of removing the perfect_quantum and causing the game to lock up again, not much can probably be done.

No.21621

Mamesick

Senior Tester

Jul 7, 2023, 15:15

edited on: Jul 7, 2023, 15:15

I would say confirmed, because this change seems to be really CPU demanding with the new 68000 core that was introduced around 0.253 if I'm not wrong:

//  config.set_maximum_quantum(attotime::from_hz(8400)); // 140 CPU slices per frame
config.set_perfect_quantum(m_maincpu); // I was seeing random lockups.. let's see if this helps

Though it's correct emulation, so I don't want to change the status of the bug to confirmed. Developers surely can say more on this.

No.21639

Osso

Moderator

Jul 10, 2023, 04:57

I agree with Mamesick that this isn't a bug, per se. Emulation speed is dragged down because this requires 'perfect' synch between the two M68000s.
Short of removing the perfect_quantum and causing the game to lock up again, not much can probably be done.