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From: Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: dosmemput and dosmemget
Date: 5 Mar 2005 12:03:41 GMT
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arizvi <ahmadwaris AT hotmail DOT com> wrote:

> I am doing a lot of IO on hard disks - large sized in the range of
> 100GB(s). That would mean millions or billions of those function
> calls.  

It would also means equally many (if not more) actual hard disk
accesses.  Those are pretty much guaranteed to be orders of magnitude
slower than any copying of data between realmode and protected mode.

Trying to eliminate memory copying in a DOS program that's going to be
waiting for the disks to spin almost all the time would be a rather
pointless exercise.

-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.