[OpenBIOS] [PATCH] RFC: Increase dictionary size on SPARC64

[Blue Swirl]

On 4/14/10, Artyom Tarasenko <atar4qemu at googlemail.com> wrote:
> 2010/4/13 Blue Swirl <blauwirbel at gmail.com>:
>
> > On 4/13/10, Mark Cave-Ayland <mark.cave-ayland at siriusit.co.uk> wrote:
>  >> Igor Kovalenko wrote:
>  >>
>  >>
>  >> > Your changes increase .bss of elf image, and that is handled by
>  >> > entry.S automatically so no changes are needed.
>  >> >
>  >>
>  >>  Okay, great :)
>  >>
>  >>
>  >> > BTW do we need 512K for forth heap? It may be enough to modify openbios.c
>  >> > setting MEMORY_SIZE to 256K and DICTIONARY_SIZE to 512k there.
>  >> > Change to ofmem_sparc64.c does not seem to be helpful.
>  >> >
>  >>
>  >>  I honestly don't know enough to make an informed choice, although my
>  >> feeling is that since PPC has 512K (and it will obviously be enough to solve
>  >> the problem with OpenSolaris) then it can't be too bad an option. Does
>  >> anyone else have a feeling one way or the other?
>  >
>  > One possible problem may be that we overrun the 32 bit address space,
>  > because there is only 3M available: 0xffd00000 to 0xffffffff.
>
>
> Oh. I guess that's the amount stored in totmap[0].num_bytes in sparc32/lib.c?
>  Then obp_dumb_memalloc really has too few space for loading Solaris kernel.
>  Maybe because the memory is not freed.

That's only on Sparc32, but memory could be tight there too, the
layout is the same.

There should be quite a few tricks to reduce memory consumption:
compile with -Os, remove or make unused code conditional, optimize
mixed C/Forth constructs like fword("xx") etc.