From: "Michael N. Filippov" <michael AT idisys DOT iae DOT nsk DOT su>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Announce: CWSDPMI r5 public beta
Date: 23 Oct 2000 14:30:36 GMT
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Charles Sandmann <sandmann AT clio DOT rice DOT edu> wrote:
> Message-ID: <39f2f37e DOT sandmann AT clio DOT rice DOT edu>
> References: <Pine DOT SUN DOT 3 DOT 91 DOT 1001022125955 DOT 3937A-100000 AT is> <39f1c1c6 DOT sandmann AT clio DOT rice DOT edu>

> CWSDPMI needs 1Kb of DOS memory for each 1Mb of address space.  When it
> does the "auto" calculation (in r4 and non-fixed r5) it would take the
> size of the physical memory and make that the assumed address space
> (with a minimum of 20Mb/20Kb - assuming small memory machines may page
> much more).  So, for r5 I'm adding an upper limit of 128Mb (128K) to
> that automatic page directory calculation (which is less than the
> 256Mb/256K maximum under r4).

Why not just add parameter "reserved DOS memory", then if (for example)
240 of 640 is taken by DOS/TSRs and "reserved DOS memory" == 100 KB
CWSDPMI would allow to work with 250-300 MB instead of this hardcoded 128.
It would be a more flexible variant for nested programs too.

Sincerely,

Michael