On Mar 12, 9:57 pm, unruh <un...@invalid.ca> wrote: > On 2012-03-13, Alby VA <alb...@empire.org> wrote: > > > > > > > > > > > On Mar 12, 7:21?pm, unruh <un...@invalid.ca> wrote: > >> On 2012-03-12, Alby VA <alb...@empire.org> wrote: > > >> > ?If your offset is between -400 to +600 ?s (microseconds), would you > >> > consider that Good, Bad, or Average? > >> > If it is less than Good, could something be tweaked to improve it? > >> > ntp.conf changes? cable changes? > >> > or I'm just SOL? > > >> What operating system? What is your server (network, wristwatch, gps, > >> pps?) For PPS you should be able to get +- 1us. for a server in Moscow, > >> +- 1ms. > > >> > Stats > >> > -------- > >> >http://godzilla.empire.org/ > >> >http://www.pool.ntp.org/scores/63.251.89.141 > > >> > assID=0 status=0115 leap_none, sync_atomic, 1 event, > >> > event_clock_reset, > >> > version="ntpd 4.2....@1.2349-o Mon Feb 20 22:00:33 UTC 2012 (1)", > >> > processor="amd64", system="FreeBSD/9.0-RELEASE", leap=00, stratum=1, > >> > precision=-19, rootdelay=0.000, rootdisp=1.082, refid=PPS, > >> > reftime=d308de90.7e20860b ?Mon, Mar 12 2012 16:44:00.492, > >> > clock=d308dec4.6a2aacac ?Mon, Mar 12 2012 16:44:52.414, peer=9406, > >> > tc=4, > >> > mintc=3, offset=0.081, frequency=-24.987, sys_jitter=6.771, > >> > clk_jitter=0.003, clk_wander=0.004 > > > The Stratum 0 devices is SureGPS and its running on FreeBSD as the OS > > and AMD for the chip. > > OK. Is it using its PPS or just the nmea sentences? If the latter then > 100us is very good for a jitter. If the former it is very bad. (My > offsets on a chrony machine are standard deviation of about .8us, and on > an nptd machine, about 2us.-- using Linux and a serial interrupt with > pps_ldisc/pps_core driver on the former, and a parallel port interrupt > routine on the latter. > > If you are just using the sure nmea sentences, then you are getting far > better than expected. (man ms is more typical from SureGPS nmea only) > > > > > > > > > > > FreeBSD godzilla.empire.org 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue > > Feb 21 22:13:35 EST 2012 amd64
Yeah it is using PPS. NOTE: refid=PPS -Alby _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
