On Thursday, October 18, 2012 6:40:01 PM UTC+8, Miroslav Lichvar wrote: > > NTP supports interleaved mode in peer associations which does the > timestamp followup. It would be really nice if ntpd supported the > SO_TIMESTAMPING option. > > http://www.eecis.udel.edu/~mills/ntp/html/xleave.html >
Days of lurking Dr. Mills' site and I didn't notice that. > > You may want to try nohz=off, it seems there is a bug in the kernel > which can cause an extra jitter of couple microseconds in the > system clock readings when the system is idle. > Must be the reason why one of my Atom machines needs a process looping a 10 ms sleep to bring the PPS jitter down. > > > 91509 509 > > 89577 -991 > > 88365 -795 > > 89574 -731 > > 90593 -163 > > 89360 -1067 > > > > > 92650 -318 > > 90634 -910 > > 89455 -989 > > 89511 -1080 > > 88874 -693 > > 88534 -1140 > > Cool. Are those numbers nanoseconds? > Original post is wrong, those are nanoseconds. _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
