Messages in this thread |  | | Date | Wed, 28 Aug 2002 07:53:19 -0600 | From | yodaiken@fsmlabs ... | Subject | Re: interrupt latency |
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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 -)
-- --------------------------------------------------------- Victor Yodaiken Finite State Machine Labs: The RTLinux Company. www.fsmlabs.com www.rtlinux.com
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