[ntp:questions] Performance?

dhavey dhavey at gmail.com
Tue Dec 23 20:20:53 UTC 2008


On Dec 22, 5:41 pm, hal-use... at ip-64-139-1-69.sjc.megapath.net (Hal
Murray) wrote:
> >I'm using Garmin LVC's.  I used the windows config program on one of
> >them and changed the baud rate to 9600, turned the PPS on, and enabled
> >NEMA 3.x.
>
> The NMEA driver in ntpd is not expecting you to change the baud rate.
> There may be some way to configure it to use other baud rates, but I
> don't remember anything like that.
>
> >The other one I configured using cu.  I turned off all of the output
> >sentences except for GPGG and turned the PPS on.
>
> The default setup for the NMEA driver is to use the GPRMC sentence.
> It can use a few others.  Check the documentation or fix it to send
> (only) the GPRMC sentence.
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.


The performance is still really bad:
     remote           refid      st t when poll reach   delay
offset  jitter
==============================================================================
x192.168.0.2     69.25.96.13      2 u    1   16  377    0.130
4.307   0.417
 192.168.0.26    192.168.0.2      2 u   47   16  210    0.000    0.000
130.357
 192.168.0.27    .STEP.          16 u    -   16    0    0.000
0.000   0.000
x192.168.0.29    .GPS.            1 u   11   16  376    0.086
-199.29   0.172
xGPS_NMEA(0)     .GPS.            0 l    4   16  377    0.000
-220.73   2.039


    remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 192.168.0.26    192.168.0.2      2 u   13   16   42    0.007
15.204   0.409
 192.168.0.27    192.168.0.29     2 u 1214   16    0    0.001
40.722   0.000
 192.168.0.28    71.80.83.0       3 u    2   16  377    0.018
199.327   0.123
*GPS_NMEA(0)     .GPS.            0 l    3   16  377    0.000
0.605   3.320




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