[ntp:questions] Performance of the shared-memory reference clock

2010-02-24 Thread Loretta Goldberg
The shared-memory reference clock was modified (ntp-4.2.5p138) to collect data each second, rather than once per polling interval.  What would be the impact of this modification on how accurately I can estimate the current time from a given GPS?    If my system requirements specify that I have

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread Kelsey Cummings
David J Taylor wrote: The reach = 0 suggests that the signals from the GPS are not being seen. I'm not sure why it lost sync but I went ahead and upgraded to 4.2.7p5 from the ntp-dev port. I'm still seeing high offset and variable jitter.

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread David J Taylor
Kelsey Cummings k...@sonic.net wrote in message news:4b8580e5$0$1616$742ec...@news.sonic.net... [] I'm not sure why it lost sync but I went ahead and upgraded to 4.2.7p5 from the ntp-dev port. I'm still seeing high offset and variable jitter.

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread Hal Murray
In article 4b8580e5$0$1616$742ec...@news.sonic.net, Kelsey Cummings k...@sonic.net writes: I'm not sure why it lost sync but I went ahead and upgraded to 4.2.7p5 from the ntp-dev port. I'm still seeing high offset and variable jitter.

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread David Lord
Kelsey Cummings wrote: David J Taylor wrote: The reach = 0 suggests that the signals from the GPS are not being seen. I'm not sure why it lost sync but I went ahead and upgraded to 4.2.7p5 from the ntp-dev port. I'm still seeing high offset and variable jitter.

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread David Lord
Kelsey Cummings wrote: David J Taylor wrote: The reach = 0 suggests that the signals from the GPS are not being seen. I'm not sure why it lost sync but I went ahead and upgraded to 4.2.7p5 from the ntp-dev port. I'm still seeing high offset and variable jitter.

Re: [ntp:questions] GPS_NEMA, but high offset and jitter?

2010-02-24 Thread Kelsey Cummings
Hal Murray wrote: How about turning off the PPS fudge flag so you know you are using the text mode. Then watch it for a while and add a fudge time2 to get it reasonably close. When that works, turn the PPS back on. I added time2 to zero out the offset and things looked good for about an