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Re: Kernel tweaks on TT030
2009/11/20 David Ross <dross%pobox.com@localhost>:
> It looks like we don't need "options FPU_EMULATE" in the ATARITT kernel
> configuration file.
> I tried commenting out that option and I now have a smaller kernel. Â=) ÂIt
> boots and seems to work. Âdmesg still says:
> Atari TT (m68030 CPU/MMU mc68882 FPU)
> Since no TT030 shipped without an FPU, we should probably make this change
> permanently in /usr/src/sys/arch/atari/conf/ATARITT.
> Â- What's something I can try quickly that would exercise the FPU, just to
'ping -c 2 localhost' should be a good test (it uses floating point
for its final summary line), though generally *something* will
coredump during the boot sequence if floating point is broken. If you
want to confirm I'll update the ATARITT kernel config.
> Â- Would it also make sense to move kernel compilation from using -m68020 to
That should already be happening,Makefile.atari includes
sys/arch/m68k/Makefile.cmachflags which sets the compile flags
automatically based on which of M6800 are defined.
> Â- How about moving from -O2 to -O3?
In general the size/speed tradeoffs in -O3 are not worthwhile. They
are a benefit in some cases, but it really involves testing before
just turning them on. Actually given the memory constraints of most
NetBSD/atari machines it might be better to compile '-O2 -Os'
> Â- Anything else we might be able to tweak for a "free" performance gain?
Well, TANSTAAFL :), but dropping FPU_EMULATE should definitely gain
memory, and I'd be curious as to some benchmarks for a kernel compiled
-O2 vs '-O2 -Os' :)
Actually, if you have a moment could you test booting
and see if it attaches a wskbd, and does the keyboard still work? :)
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