From:	"Damian Yerrick" <web DOT poison AT pineight DOT 8m DOT com>
Newsgroups:	comp.os.msdos.djgpp
References:	<Pine DOT SUN DOT 3 DOT 91 DOT 991011122627 DOT 28307G-100000 AT is> <380282EA DOT 3E6A AT earthlink DOT net> <Pine DOT SUN DOT 3 DOT 91 DOT 991013114157 DOT 16702F-100000 AT is> <38063D49 DOT 12D7 AT earthlink DOT net> <Pine DOT SUN DOT 3 DOT 91 DOT 991017141953 DOT 25053R-100000 AT is>
Subject:	Re: allegro gone missing?
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NNTP-Posting-Date:	Wed, 20 Oct 1999 05:02:35 GMT
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Date:	Wed, 20 Oct 1999 05:02:35 GMT
To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Eli Zaretskii <eliz AT is DOT elta DOT co DOT il> wrote in message
news:Pine DOT SUN DOT 3 DOT 91 DOT 991017141953 DOT 25053R-100000 AT is...

Where is il?

>
> Even a program that does nothing except being parked in an idle loop
> involves the DPMI server, since there's a timer tick every 55 msec,
> which triggers a mode switch (to reflect the interrupt to its default
> real-mode handler).
>
> In addition, if the setup of the machine under the two DPMI servers
> being compared is different, it might well be that the difference has
> nothing to do with the DPMI server per se.  For example, if one
> configuration runs the machine in V86 mode and the other in the true
> real mode, the mode-switch overhead is *much* larger in the real-mode
> setup, no matter what DPMI host is in use.

Oh, BTW, Eli meant the mode switches between real and
protected mode that happen hundreds or thousands of
times a second, several times each interrupt.

--
Damian Yerrick
CM 398, Rose-Hulman Institute of Technology
5500 Wabash Ave
Terre Haute, IN 47803
http://come.to/yerrick

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