On Wed, Dec 17, 2008 at 07:34:07PM +0100, Markus Hennecke wrote:
> Raimo Niskanen schrieb:
> >[config description]
>
> >But how to find a bigmem parameter I do not know, I have
> >no amd64 system. Try 'help' in the config editor.
> >
> >And, as pointed out before:
> >
> > If you search the archives, you'll find the clue you need to enable it
> > on your own system.
> >
> >See also:
> > config(8)
> > options(4)
> > boot_config(8)
> > boot_i386(8)
> > boot(8)
>
> So I read all that before and now I have to out me as plain stupid. I
> still have no clue how to set bigmem to 1 using config(8). And as you
> can see in this thread, it looks like I am not alone. Either I read over
> it on more than one occasion, or there is no documentation describing it.
Sorry about that. I could only give you some pointers on how to use
UCK(config(8)) and have no amd64 system myself, so I deemed it probably
futile for me to try to find the bigmem parameter.
Then I assumed the rest of the clues _would_ be in the archives
but did not search myself. They still might be in the archives
but a later post in this thread suggests you can not do this with
config(8). You probably will have to compile a kernel.
I have searched the 4.4 kernel source tree and found:
$ find sys -type f | xargs grep -i bigmem
sys/arch/amd64/amd64/machdep.c:int bigmem = 1;
sys/arch/amd64/amd64/machdep.c: if (bigmem)
sys/arch/amd64/amd64/machdep.c: printf("Bigmem = %d\n", bigmem);
sys/arch/amd64/amd64/machdep.c: if (!bigmem && (e1 >= (1UL<<32))) {
sys/arch/amd64/amd64/machdep.c: } else if (bigmem && (e1 >= (1UL<<32)))
{
The revision of the file is 1.81 so that was just
before the release. In the cvsweb
http://www.openbsd.org/cgi-bin/cvsweb/src/sys/arch/amd64/amd64/machdep.c
it says bigmem was set to 0 for the release of 4.4, and it still is
(revision 1.85).
I can also not find a documented way to tweak it from config(8)
as it is stated on the comment line before "int bigmem = 0;".
It is probably daft simple or untrue. But changing the line to
"int bigmem = 1;" in the source code will certainly do the trick.
>
> Kind regards,
> Markus
--
/ Raimo Niskanen, Erlang/OTP, Ericsson AB
