 To: Peter C. Wallace <> From: Alfred Perlstein <> List: tech-
kern Date: 11/14/2001 20:29:04 * Peter C. Wallace <> [011114
20:11] wrote: >       I've been curious about this myself. We
have a little PC/104 card > that is a 8 axis host based servo
motor controller. For most motors you > need a 3-4 KHz interrupt
rate to get good performance (though larger > slower motors can
use a slower update rate) This works fine on DOS where > nothing
else is really happening, but would this high an interrupt rate
be > possible with NetBSD? >       The calculations for 8 axis
of simple PID + feed forward + > profile generation take very
little time on a 486, but the interrupt > latency is liable to
be the problem. >       I guess the rate of lost characters on
an unbuffered serial port might > give a clue... > Anyone run an
8250 at 38400 baud? >       If anyone is interested in playing
with the hardware, I am willing > to donate motor controller
cards (and ISA adapters if needed)  Three to four thousand
interrupts a second sound like quite the