X-Authentication-Warning: delorie.com: mailnull set sender to djgpp-bounces using -f
From: "Charles Sandmann" <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Large memory usage CWSDPMI test available
Date: Sun,  2 Dec 2001 22:26:46
Organization: Aspen Technology, Inc.
Lines: 18
Message-ID: <3c0aaaa6.sandmann@clio.rice.edu>
NNTP-Posting-Host: dcloan.hou.aspentech.com
X-Trace: selma.aspentech.com 1007354676 18141 10.32.115.107 (3 Dec 2001 04:44:36 GMT)
X-Complaints-To: postmaster AT aspentech DOT com
NNTP-Posting-Date: 3 Dec 2001 04:44:36 GMT
X-NewsEditor: ED-1.5.8
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

I've put a copy of a new WIP CWSDPMI (pre-alpha test) on 

  http://clio.rice.edu/djgpp/csdpmi6.zip

This version implements 4Mb pages on hardware that support it (Pentium+
without VCPI).  This decreases the DOS memory footprint for large memory
systems and increases the performance when using more than 500Mb of 
physical memory.

If you have more than 400Mb of memory in your system and need to use it 
under DOS (not Windows) quickly - you might be interested.  If not, don't 
mess with it.

This also gives an early glimpse of the the way the 4Mb paging stuff might
work (interesting for those who do DMA or mess with page tables).  In 
particular, I haven't decided how this should work (if at all) with 
virtual memory.  Does anyone want to bother with virtual memory if they
have more than 500Mb of physical memory and are running under DOS?