David L. Mills wrote: > > The NTP discipline is basically a type-II feedback control system. Your > training should recall exactly how such a loop works and how it responds > to a 50-ms step. Eleven seconds after NTP comes up the mitigation
You both have problems here. Dave Mills: your problem is that you haven't explained why one should continue to use a long time constant linear feedback system when a human observer can easily tell you how to get within 10 microseconds of the correct time after no more than about 3 samples. Bill Unruh: you haven't explained what real world situation this test is simulating; it is a standard doctrine that ntpd is not a substitute for good hardware and system software (e.g. you shouldn't use ntpd to get round lost clock interrupts). > algorithms present that transient to the loop and what happens > afterwards conforms to the equations of control theory. Discussion about > what happens at any time after that is a matter of mathematics and ntpd > does conform to the mathematics as confirmed by observation and simulation. That's an indication that the equations are inappropriate in that context. _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
