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Old 03 January 2018, 07:37   #1
Zilog
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Join Date: May 2014
Location: Italy
Posts: 94
Slow with MMuLib installed

Hy Tony,
the configuration are Amiga 4000D with 68030 + MMU + FPU 68882( if present or no data cache are indifferent)
The problem are present with either winaue v3.5 and with v.3.6 beta. (before version i never tested)
Have installed workbech 3.1 or 3.9BB4, setPath , e MMulib 46.13 e MUI.
Whe Installed MMULib (too only library) the opreration to disk and the velocty of ram are more slowly:

SySpeed 2.6 Benchmark

Drive
With MMuLib Not Installed - Installed
speedDrive.jpg

Memory
With MMuLib Not Installed - Installed
speedMemoryjpg.JPG


My Configuration
@Amiga.4000_030_Os.v3.x.uae

Thanks for support.
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Old 03 January 2018, 10:21   #2
Toni Wilen
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Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 42
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MMU emulation is slow, each CPU memory access needs extra MMU translation checks. MMU emulation is mostly inactive (but will still cause some speed penalty) until MMU is enabled.

It won't increase performance like it does on real hardware. Real hardware needs help from the MMU to be able to use 68040+ caches fully (copy back mode) without major stability problems.

MMU emulation is mainly useful for debugging, development and ability to run unix-like operating systems.

68040+ MMU "fast path" probably can be optimized much more but it isn't that important because MMU is "never" needed in normal m68k AOS use.
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Old 03 January 2018, 11:23   #3
Zilog
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Join Date: May 2014
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Posts: 94
Quote:
Originally Posted by Toni Wilen View Post
.....

68040+ MMU "fast path" probably can be optimized much more but it isn't that important because MMU is "never" needed in normal m68k AOS use.
Thanks a lot for answer Tony.
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