[ntp:questions] Offset Average (Normal)?
Alby VA
albyva at empire.org
Tue Mar 13 01:27:52 UTC 2012
On Mar 12, 9:17 pm, Alby VA <alb... at empire.org> wrote:
> On Mar 12, 7:21 pm, unruh <un... at invalid.ca> wrote:
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> > On 2012-03-12, Alby VA <alb... at empire.org> wrote:
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> > > 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
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> > > assID=0 status=0115 leap_none, sync_atomic, 1 event,
> > > event_clock_reset,
> > > version="ntpd 4.2.... at 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.
>
> FreeBSD godzilla.empire.org 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue
> Feb 21 22:13:35 EST 2012 amd64
My whole setup isn't anything special. SureGPS is modified so you get
PPS.
RS232 cable to COM1 on a FreeBSD box. USB providing power. And several
NIST/USNO servers in ntp.conf for reference.
remote refid st t when poll reach delay
offset jitter
==============================================================================
ntp2.usno.navy. .USNO. 1 u 11h 128 0 21.392
11.022 0.000
-ntp0.usno.navy. .USNO. 1 u 512 128 370 25.747
-0.242 3.378
+ntp1.usno.navy. .USNO. 1 u 51 128 377 30.361
-1.445 2.473
-time-a.nist.gov .ACTS. 1 u 136 128 336 19.894
0.582 5.715
+time-b.nist.gov .ACTS. 1 u 64 128 57 19.100
-0.948 2.129
oPPS(0) .PPS. 0 l 13 16 377 0.000
0.502 0.153
*GPS_NMEA(0) .GPSb. 0 l 12 16 377 0.000
-38.705 13.177
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