From: Scott G. (seg at us.ibm.bogus.com)
Subject: New kernel highmem feature
Newsgroups: comp.os.os2.bugs
Date: 2004-01-19 10:31:02 PST

For people who want to try out the latest stuff: As of the 20040116 kernels,
I added a new feature, which should be considered beta/experimental. This
feature allows loading parts of DLLs above the 512mb line. So, any DLL
objects that do not need to be called by (for code) or addressed by (for
data) 16 bit code can be moved out of the low shared arena. Since this is the
place that most often runs out of room, causing sys0008 and similar, I'm
hoping this is helpful.

Here's how it works: A new EXEHDR flag /HIGHMEM[:objnum] is used to turn on
bit 16 of the OTE flags in one or more linker objects (if you don't know what
this means, don't worry). If this flag is on and if the object is a 32 bit
shared obj and isn't also marked as ALIAS, PACK, or IOPL, the kernel will try
to load the object in the high shared arena,   I've experimented with Mozilla
and saved nearly 11mb of shared memory address space.

Download whatever kernel you need from ftp://testcase.boulder.ibm.com, then
also download hdrtest.zip from that directory. What has worked for me is
 EXEHDR /HIGHMEM MMPARTS.DLL  > nul
 EXEHDR /HIGHMEM:1 xx.dll  > nul
              ; where xx is ever DLL in mozilla and mozilla/components except
npoji6.dl.
For mmparts, you'll have to do this from a command prompt or something.

I will be interested in feedback.

 -Scott
seg at us.ibm.bogus.com