[ntp:questions] linux native pps testing
rtxo
gnu at localhost.wraith.sf.ca.us
Wed Jun 2 22:53:15 UTC 2010
Hi Folks--
Looks like testing gentoo linux 2.6.34 with glibc 2.11.1 and the
ntp-dev ntpd 4.2.7p32 at 1.2144-o code work as native pps support:
root at penelope.wraith.sf.ca.us[612] ntpq -p
remote refid st t when poll reach delay offset jitter
==============================================================================
oGPS_NMEA(0) .GPS. 0 l 47 64 377 0.000 0.003 0.001
root at penelope.wraith.sf.ca.us[613] ntptime
ntp_gettime() returns code 0 (OK)
time cfb15d43.7ddf5460 Wed, Jun 2 2010 15:44:19.491, (.491689064),
maximum error 25431 us, estimated error 0 us
ntp_adjtime() returns code 0 (OK)
modes 0x0 (),
offset 2.515 us, frequency 72.506 ppm, interval 1 s,
maximum error 25431 us, estimated error 0 us,
status 0x2007 (PLL,PPSFREQ,PPSTIME,NANO),
time constant 6, precision 0.001 us, tolerance 500 ppm,
Plotting so far shows +/- 30 microsecond swings. To be watched.
The frequency plot looks very good, though the mobo is an old
low poh unit. Plotting url:
http://www.wraith.sf.ca.us/ntp/rrd/index.html
Hm, time to update my web server, prolly move to gentoo :)
//Steve
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