On Thu, Nov 20, 2014 at 10:16:13AM +0000, David Taylor wrote: > Running the sleep 10 sequence from a command procedure gives a difference of > 1055, so I guess that's 105.5 interrupts per second. Does sound like 100 > Hz, yes. > > Running the command while another terminal was running "cat /dev/urandom > > /dev/null" resulted in 1063 interrupts, so 106.3 Hz. > > Does that mean I'm tickless or not?
It seems it's not running in the tickless mode and the problem with zero jitter is caused by something else. Do you have PPS kernel discipline enabled in your ntpd config (flag3) and which driver do you use? The PPS discipline is always disabled when the Linux kernel is compiled with NO_HZ, so I think that could explain what you are seeing. I'm not sure if that would be an ntpd bug or kernel bug, but I can look into it. -- Miroslav Lichvar _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
