From: Aylott Mark To: "'Derbyshire Paul - DJGPP'" Cc: DGJPP Newsgroup Subject: Re: DPMI Host limited to 64MB physical memory on Compaq PC ?? Date: Wed, 04 Jun 97 19:01:00 PDT Message-ID: <3396CF50@smtpgate.villingen> Encoding: 56 TEXT Precedence: bulk Derbyshire Paul (ao950 AT FreeNet DOT Carleton DOT CA) wrote : > > Aylott Mark (AylottM AT thmulti DOT com) writes: > > Does anyone have any reasons why no matter what > > I do in the way of machine config I cannot get more > > than 64MBytes allocatable physical memory when > > the machine I am using has 128MBytes physical > > memory ?? > > > > The application I have is to generate a digital video > > transport stream, and at the output speed required > > virtual memory access time is too long. I therefore > > disable the swap file and load the transport stream > > data into physical memory. > > > > I have tried a variety of HIMEM.SYS drivers > > and have found that the /EISA argument is > > necessary otherwise the program sees only > > 16MB. > > Try ditching any third party memory drivers, and not loading any Windows > you have, and running from solid DOS. CWSDPMI will then be used for memory > management/DPMI, and will see all 128 megs. > > -- Thanks for the reply and ideas. I have ditched all 3rd party memory drivers ( blank config.sys ), and loaded nothing in the autoexec.bat so it's using CWSDPMI My memory test program mallocs 1 meg blocks until it can't anymore. Now I get 13MB of memory. The dpmi info call reports 3840 physical pages ( = 15360 kBytes ) With HIMEM.SYS /EISA loaded I get 62MB So it seems that CWSDPMI is not seeing all 128MB. I have tried changing the CWSDPMI parameters with the CWSPARAM program with no success. Any further ideas ?? Thanks, Mark. __________________________________________________________________ Mark AYLOTT Digital Test Lab. Thomson multimedia R&D France Tel: (+33) (0)2 99 27 36 09 1 Ave de Belle fontaine, Fax: (+33) (0)2 99 27 30 05 35511 CESSON-SEVIGNE, Cedex, France. E-mail: aylottm AT thmulti DOT com ___________________________________________________________________