[ntp:questions] NTP server with Garmin GPS 18 LVC

David Lord snews at lordynet.org
Fri Dec 20 12:21:08 UTC 2013


Harlan Stenn wrote:
> David Lord writes:
>> If ntpd is throwing away 7 out of 8 polls I'd say their results
>> could be similar to mine.
> 
> ntpd doesn't throw away 7 out of 8 polls, Bill just likes to say that.
> 
> ntpd chooses the best data it sees (for its definition of "best") and
> uses those.

I should have included a smiley :-)

Even though the CPU is a 133 MHz 486 class I am surprised at
the level of jitter shown on the graph for the serial port.

I'm using a 600 MHz via epia-m with serial PPS derived from TTL
out from the GPS.

associd=0 status=011d leap none, sync_pps, 1 event, kern,
version="ntpd 4.2.7p401 at 1.2483-o Sat Nov 30 16:37:14 UTC 2013 (1)",
processor="i386", system="NetBSD/6.1_STABLE", leap=00, stratum=1,
precision=-17, rootdelay=0.000, rootdisp=400.195, refid=PPSb,
reftime=d65eab4f.536dbb62  Fri, Dec 20 2013 11:41:03.325,
clock=d65eab5c.806d7623  Fri, Dec 20 2013 11:41:16.501, peer=9782, tc=4,
mintc=3, 0ffset=-0.001152, frequency=-36.989, sys_jitter=0.007629,
clk_jitter=0.002, clk_wander=0.001, tai=35, leapsec=201207010000,
expire=201406280000


David



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