PPS_SYNC and NTP refclocks

To: current-users%netbsd.org@localhost
Subject: PPS_SYNC and NTP refclocks
From: Dave Tyson <dtyson%wirralcavinggroup.org.uk@localhost>
Date: Tue, 7 Aug 2012 23:52:42 +0100
Is anyone successfully running a stratum 1 server using NetBSD current?

Having successfully run a stratum 1 server in $DAYJOB 6 years ago on NetBSD 4 
using Trimble GPS hardware, I thought I would try using a more modern release 
and a recently acquired Oncore GPS receiver. I hooked up the hardware to an 
old Pentium 4 PC running a recent snapshot (6.99.10/i386). GPS attached to 
/dev/tty00 via a level converter with PPS on DCD

/dev/tty00 syslinked to /dev/oncore.serial.0 & /dev/oncore.pps.0

Generic kernel compiled with additional PPS_SYNC option

/etc/ntp.oncore.0 =>
MODE 1
LAT 53 25 33.01
LONG 3 2 32.78
HT 109.41M
TRAIM NO
HARDPPS 
SHMEM /var/log/ntpstats/ONCORE.0

/etc/ntp.conf =>
pidfile         /var/run/ntpd.pid
driftfile       /var/db/ntp.drift
logconfig       -syncstatus
tos             minsane 2
statistics loopstats
statsdir /var/log/ntpstats/
filegen peerstats file peers type day link enable
filegen loopstats file loops type day link enable
server          127.127.30.0
server          nero.grnet.gr
server          hora.roa.es
server          ntp0.fau.de
server          ntp2.oma.be
server          canon.inria.fr

Bringing up ntp, the refclock is found and is being read, but the pps doesn't 
seem to be working. There is definately a pulse on DCD.

Aug  7 23:04:29 dev ntpd[105]: ntpd 4.2.6p5-o Wed Feb  1 07:49:06 UTC 2012 
(import)
Aug  7 23:04:29 dev ntpd[754]: proto: precision = 2.514 usec
Aug  7 23:04:29 dev ntpd[754]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen and drop on 1 v6wildcard :: UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen normally on 2 fxp0 
fe80::203:47ff:fee6:2e17 UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen normally on 3 fxp0 192.168.0.3 UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen normally on 4 lo0 127.0.0.1 UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen normally on 5 lo0 ::1 UDP 123
Aug  7 23:04:29 dev ntpd[754]: Listen normally on 6 lo0 fe80::1 UDP 123
Aug  7 23:04:29 dev ntpd[754]: peers refreshed
Aug  7 23:04:29 dev ntpd[754]: Listening on routing socket on fd #27 for 
interface updates
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: ONCORE DRIVER -- CONFIGURING
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: state = ONCORE_NO_IDEA
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: Input mode = 1
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: Initializing timing to Assert.
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: HARDPPS Set.
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: SHMEM (size = 3628) is CONFIGURED 
and available as /var/log/ntpstats/ONCORE.0
Aug  7 23:04:29 dev ntpd[754]: ONCORE[0]: state = ONCORE_CHECK_ID
Aug  7 23:04:35 dev ntpd[754]: ONCORE[0]: Oncore: Resend @@Cj
Aug  7 23:04:35 dev ntpd[754]: ONCORE[0]: Oncore: Resend @@Cj
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: @@Cj
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: COPYRIGHT 1991-1996 MOTOROLA INC.
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: SFTW P/N #     98-P36847P 
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: SOFTWARE VER # 1          
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: SOFTWARE REV # 7          
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: SOFTWARE DATE  AUG 20 1997
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: MODEL #    R1121N1145     
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: HWDR P/N # 1              
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: SERIAL #   R013RV         
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: MANUFACTUR DATE 7G23      
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]:                           
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: This looks like an Oncore GT with 
version 1.7 firmware.
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: Channels = 8, TRAIM = OFF
Aug  7 23:04:52 dev ntpd[754]: ONCORE[0]: state = ONCORE_CHECK_CHAN
Aug  7 23:04:57 dev ntpd[754]: ONCORE[0]: Input   says chan = -1
Aug  7 23:04:57 dev ntpd[754]: ONCORE[0]: Model # says chan = 8
Aug  7 23:04:57 dev ntpd[754]: ONCORE[0]: Testing says chan = 8
Aug  7 23:04:57 dev ntpd[754]: ONCORE[0]: Using        chan = 8
Aug  7 23:04:57 dev ntpd[754]: ONCORE[0]: state = ONCORE_HAVE_CHAN
Aug  7 23:04:58 dev ntpd[754]: ONCORE[0]: state = ONCORE_TEST_SENT
Aug  7 23:05:08 dev ntpd[754]: ONCORE[0]: GPS antenna: OK
Aug  7 23:05:08 dev ntpd[754]: ONCORE[0]: state = ONCORE_INIT
Aug  7 23:05:09 dev ntpd[754]: ONCORE[0]: Setting Posn from input data
Aug  7 23:05:09 dev ntpd[754]: ONCORE[0]: state = ONCORE_ALMANAC
Aug  7 23:05:12 dev ntpd[754]: ONCORE[0]: Posn:
Aug  7 23:05:12 dev ntpd[754]: ONCORE[0]: Lat = N  53.4258361deg,    Long = E   
3.0424389deg,    Alt = 109.41m (358.96ft) GPS
Aug  7 23:05:12 dev ntpd[754]: ONCORE[0]: Lat = N  53deg 25.5502m,   Long = E   
3deg  2.54633m,  Alt =  109.41m ( 358.96ft) GPS
Aug  7 23:05:12 dev ntpd[754]: ONCORE[0]: Lat = N  53deg 25m 33.01s, Long = E   
3deg  2m 32.78s, Alt =  109.41m ( 358.96ft) GPS
Aug  7 23:05:12 dev ntpd[754]: ONCORE[0]: Cable delay is set to 0 ns
Aug  7 23:05:14 dev ntpd[754]: ONCORE[0]: Have now loaded an ALMANAC
Aug  7 23:05:14 dev ntpd[754]: ONCORE[0]: state = ONCORE_RUN
Aug  7 23:05:14 dev ntpd[754]: ONCORE[0]: SSstate = ONCORE_SS_DONE
Aug  7 23:05:15 dev ntpd[754]: ONCORE[0]: ONCORE: Detected TRAIM, TRAIM = ON
Aug  7 23:05:15 dev ntpd[754]: ONCORE[0]: Input   says TRAIM = 0
Aug  7 23:05:15 dev ntpd[754]: ONCORE[0]: Model # says TRAIM = 0
Aug  7 23:05:15 dev ntpd[754]: ONCORE[0]: Testing says TRAIM = 1
Aug  7 23:05:15 dev ntpd[754]: ONCORE[0]: Using        TRAIM = 0
Aug  7 23:05:16 dev ntpd[754]: ONCORE[0]: 3553365898.121663721 2012 220 22  5 
16 58 rstat   08 dop  0.0 nsat  0,4 traim 0,x,x sigma xx neg-sawtooth xxx sat 
85780000
Aug  7 23:05:18 dev ntpd[754]: ONCORE[0]: 3553365918.050198554 2012 220 22  5 
18 18 rstat   08 dop  0.0 nsat  0,4 traim 0,x,x sigma xx neg-sawtooth xxx sat 
85780000
Aug  7 23:05:19 dev ntpd[754]: ONCORE[0]: ONCORE: oncore_get_timestamp, error 
serial pps
Aug  7 23:05:20 dev ntpd[754]: ONCORE[0]: 3553365920.050234931 2012 220 22  5 
20 20 rstat   08 dop  0.0 nsat 10,4 traim 0,x,x sigma xx neg-sawtooth xxx sat 
85783000
Aug  7 23:05:21 dev ntpd[754]: ONCORE[0]: ONCORE: oncore_get_timestamp, error 
serial pps
Aug  7 23:05:24 dev syslogd[216]: last message repeated 2 times
...

Keeping the same hardware I swapped the disk caddy and loaded FreeBSD 9, same
version of ntp, same ntp.conf, ntp.oncore.0 etc. That seemed to come up
without any issues and although the loopstats don't look wonderful it does
seem to handling the pulses. dmesg similar to above without the 'error serial 
pps' messages.

Any clues?

Cheers,
Dave

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