Re: [B2-devel] JIT-enabled BasiliskII for Linux/i386

[Gwenole B. <gb...@di...>]

Christian Bauer wrote:

Hi,

> It seems somewhat unstable, though. If I set the CPU type to anything other
> than 68040, all I get is a black window.

Hmm, that might be because we don't have specialised versions of
comp_smalltbls for CPU lower that 68040. i.e. 68040 is always assumed. I
will try to fix it soon.

> And even with 68040, I can't get it
> to complete booting MacOS (tried 7.0.1, 7.5.3 and 7.6.1, with and without
> extensions). The error messages are various, ranging from "illegal instruction"/
> "fpu not installed" MacOS dialog boxes to "Illegal instruction" messages from
> B2 and segmentation faults.

Seems to be due to the lazy flusher :-( I got similar problems while
developing it but it did work for me with MacOS 8.1. I should have tried
with earlier versions of MacOS...

Try to disable the lazy flusher in compemu.h by setting
ENABLE_SOFT_FLUSH to 0.

> I tried "jitcachesize" values of 128K and 512K (prefs_items.cpp/
> AddPrefsDefaults() should set a reasonable default value).

The value I use is the minimal cache size value used for the DR-emulator
from Apple, that is to say 256 KB. I think it's reasonnable but higher
values will get better performance with the lazy flusher while no gain
is accomplished otherwise.

Thanks Christian for all those reports. I think I will make publicly
available some builds before commiting to the CVS.

Bye.