Re: [hatari-devel] MMU impact on emulated perf?

[Nicolas Pomarède <npomarede@xxxxxxxxxxxx>]

Le 03/10/2021 à 16:26, Christian Zietz a écrit :
> Eero Tamminen schrieb:
>
> > According to Zamuel's latest post, there's something odd in Hatari CACR
> > handling:
> > https://www.atari-forum.com/viewtopic.php?p=423066#p423066
>
> Not that I want to investigate, but if I were to do so, I would ask him
> for his program that he constantly keeps referring to; the one that
> gives so and so many FPS. Otherwise, it's just guesswork, I'm afraid. My
> investigation with CoreMark show that Hatari's Falcon emulation is not
> fully accurate, but this doesn't have to have the same cause as for his
> program.

Hi

same for me, Hatari 68030's cycle accuracy is known to be not that good 
at the moment, and even more if cache/mmu are used as the internal 
working of these at the cpu/opcode level is not known yet.

There could be some error in cache CACR, maybe when going from on to off 
or the oppposite and Hatari forget to set things correctly at the cpu 
emulation level, but I'm not aware of such case. Best would be a very 
small program that does this CACR change and exhibit the problem.

Nicolas