From:	Schuster <Schuster AT eev DOT e-technik DOT uni-erlangen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Interrupts Maximum Rate
Date:	Thu, 10 Apr 1997 08:04:33 -0700
Organization:	Lehrstuhl fuer Elektrische Energieversorgung
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Peter Berdeklis wrote:
> The FAQ suggests that anything more than 10Khz might need a RM handler as
> well.  However, if you've got a P90 then the extra clock cycles probably
> aren't a big deal.

I've made a test:
Envoking a Hardware-interrupt by a small timing - circuit in the ISA
Bus.
The Interrupt PM handler just increments a counter, after a minute stops 
and gives out the calculated frequency = counter/60sec.
The frequency of the circuit is variable, and is 
additionally measured, so the calculated frequency can be prooved.

Here the results:

P120 - Triton I chipset (Intel): 58 kHz
486 DX50 (AMD): 35 kHZ

Additional, if I do 12 imports (0 WS) in the Handler, the result is:

P120 - Triton I chipset (Intel): 40 kHz
486 DX50 (AMD): 22 kHZ

... Just in case, somebody wants to know.
(Perhaps an update in the FAQ, Eli?)
-- 
**********************************************
Michael Schuster
E-mail: Schuster AT eev DOT e-technik DOT uni-erlangen DOT de
Lehrstuhl fuer Elektrische Energieversorgung
http://www.eev.e-technik.uni-erlangen.de/

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