After upgrading ntp from 4.2.4p4 to 4.2.6p2 as part of a Linux upgrade from Debian Lenny to Squueze, I've noticed that the precision variable has changed from -20 to -22. So it appears that my clock has now got a better precision. But the hardware is unchanged, and I'm running the same kernel.
I thought the precision was dependent on the "granularity" of the system clock, which I would have expected to be independent of the ntp version and any other userland code. Am I misunderstanding something perhaps? Here's the outputs of "ntpq -c rv" on both versions: ntpq -c rv for ntp 4.2.4p4: assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/strat_chg, version="ntpd 4.2.4p4@1.1520-o Sun Nov 22 17:34:54 UTC 2009 (1)", processor="i686", system="Linux/2.6.32.61-nta-20405", leap=00, stratum=3, precision=-20, rootdelay=11.891, rootdispersion=82.127, peer=60194, refid=178.18.118.13, reftime=d700bca2.cf74a3b2 Tue, Apr 22 2014 11:02:10.810, poll=10, clock=d700c225.252de5e0 Tue, Apr 22 2014 11:25:41.145, state=4, offset=-0.307, frequency=-89.946, jitter=0.434, noise=0.266, stability=0.029, tai=0 ntpq -c rv for ntp 4.2.6p2 associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync, version="ntpd 4.2.6p2@1.2194-o Sun Oct 17 13:45:13 UTC 2010 (1)", processor="i686", system="Linux/2.6.32.61-nta-20405", leap=00, stratum=3, precision=-22, rootdelay=31.619, rootdisp=60.232, refid=217.114.59.3, reftime=d705fe90.065494fe Sat, Apr 26 2014 10:44:48.024, clock=d7060569.8677132b Sat, Apr 26 2014 11:14:01.525, peer=6347, tc=10, mintc=3, offset=0.161, frequency=-89.952, sys_jitter=0.247, clk_jitter=0.196, clk_wander=0.017 _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
