From:	Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: DPMI-Alloc with 192MB RAM - how ?
Date:	Fri, 23 Jul 1999 15:41:49 CDT
Organization:	Rice University, Houston, Texas
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Message-ID:	<3798d38d.sandmann@clio.rice.edu>
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> : 1) To provide more than 128Mb virtual memory you need to use CWSPARAM to 
> :    increase the max swap file size.  This eats up DOS 640K memory - about
> :    32 bytes for each 1 Mb maximum swap usage (for the bitmap).  This would
> :    be an extra 4K of DOS memory to go from 128Mb virtual to 256Mb virtual.

> 4KB is a small price to pay (IMHO). Why not set the maximum as default?

In r5 the maximum will be 2Gb which would consume an extra 64Kb.  Dos memory is
a precious resource which is needed for DMA buffers, nested images, and 
pagetables.  The number of users which needed more than 128Mb of virtual 
memory (in 1995 it would take about 2 minutes just to read that from disk
and another 2 minutes to write it...) is very, very small.  I'm open to what
the default should be, but I figured 128Mb virtual was enough.  If you need
to run something that big you probably ought to buy more real memory :-)

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