Re: interrupt latency

yodaiken
2002-08-28T13:50:54Z

On Wed, Aug 28, 2002 at 08:18:25AM -0400, Richard B. Johnson wrote:
> No, no, no. There is no such port read that takes 18 microseconds, even
> on old '386 machines with real ISR slots. A port read on those took
> almost exactly 300 nanoseconds and, in fact, was the limiting factor
> for the programmed I/O devices on the ISA bus.

Amazing how they can do that with a bus clock that is much slower -)

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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com