From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: allegro gone missing?
Date: Wed, 20 Oct 1999 14:19:58 +0200
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On Wed, 20 Oct 1999, Damian Yerrick wrote:

> > 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.

Which interrupts fire with this frequency?

I was talking about the timer and the keyboard, which are nowhere near 
these numbers.