On Wed, Jul 17, 2019 at 7:59 PM William Unruh <un...@invalid.ca> wrote: > I suspect it will be a bad outcome. The rpoblem is that you get > interrupt contention, and the two interrups will put in time delays into > the second one processed. >
That was my observation when I did some tests years ago with a single core Atom. With a dual core CPU, the interrupts can be simultaneously handled by both cores. In the attached plot, the parallel port timestamps are ahead by around 3 us, probably due to the RS232 line driver/receiver. When only one core is enabled, the serial port is handled first followed by the parallel port which causes a delay of around 10 us. The delay disappears when the serial port source is disconnected. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
