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- Subject: Re: [hatari-devel] relative perf between 030 / DSP / CPU?
- From: Eero Tamminen <oak@xxxxxxxxxxxxxx>
- Date: Wed, 25 Jun 2025 23:34:53 +0300
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Hi,
On 25.6.2025 10.56, Nicolas Pomarède wrote:
I would need to have a closer look for DSP,
Laurent stated earlier (maybe few years back) that DSP side is accurate,
I guess the issue is relative speed between CPU vs DSP.
but for FPU Toni/WinUAE told
that it was not cycle accurate at all ; cycles are not known so I guess
it uses a rough estimate that will be ok in some cases and not in others
Ok.
As to why FPU would be slower when using MMU, either it's a different
code path in WinUAE or there's sthg wrong in Hatari.
Do you have some Amiga FPU test that could be used to test this?
If it shows a clear perf difference, I think issue is definitely on
WinUAE side.
Note that MMU emulation has no cycle exact behaviour, so if you want to
compare with/without MMU, be sure to not use "cycle exact" mode in Hatari
What exactly is not cycle-exact when MMU is enabled; just the
virtual->physical address translation or also something else?
Eero