On Sat, Jul 20, 2019 at 2:26 AM Gabs Ricalde <gsrica...@gmail.com> wrote: > > 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.
It seems the attachments were too large, trying again. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
