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From: add@sciences.sdsu.edu (James D. Murray)
Newsgroups: comp.sys.intel,alt.lang.asm
Subject: Re: Need help in porting 8088/286 assembly code to 386.
Message-ID: <1991Jun29.160251.875@sciences.sdsu.edu>
Date: 29 Jun 91 16:02:51 GMT
References: <1991Jun28.055946.2521800@locus.com>
Organization: San Diego State University, College of Sciences
Lines: 18

dana@locus.com (Dana H. Myers) writes:
>
>   I'm a little surprised. Loading a segment register in Real Mode is
> comparable on both CPUs. Loading a segment register in Protected Mode
> is comparable on both CPUs.

	The problem is not how long is takes to load a segment register once,
but how many times does a program have to reload the segment registers during
execution.  I'm not sure why, but 8088/286 machines seem to loose track of
the information in their segments forcing them to reload their segments
periodically.  This causes programs to slow down quite a bit.  This is not a
problem for a 386 running one giant segment.

-- 

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