[LinuxPPS] gps influence

Udo van den Heuvel udovdh at xs4all.nl
Wed Dec 13 14:43:43 CET 2006


Udo van den Heuvel wrote:
> So I download the patch to 2.6.19.1. and compiled, booted.

[...]

> Then I unplugged the gps.
> 
> [root at epia ~]# ntpq -pn
>      remote           refid      st t when poll reach   delay   offset
> jitter
> ==============================================================================
>  127.127.1.0     .LOCL.          10 l   45   64  377    0.000    0.000
>  0.001
>  127.127.20.0    .GPS.            8 l  81m   16    0    0.000    0.000
>  0.001
> +194.109.22.18   193.67.79.202    2 u    3   64  377    9.531  -63.429
> 15.054
> *193.67.79.202   .GPS.            1 u   33   64  377   15.013  -61.513
>  9.578
> +193.79.237.14   .GPS.            1 u   52   64  377   24.107  -68.326
>  5.637
>  82.92.197.115   .STEP.          16 u    - 1024    0    0.000    0.000
>  0.000
> +82.93.103.174   .GPS.            1 u   30   64  377   31.068  -69.758
>  2.724
> -83.83.82.105    193.79.237.14    2 u    2   64  377   16.881  -61.174
> 13.112
> 
> And stuff got better again.
> So what does a stratum 8 gps do!?
> Any ideas?
> /proc stuff still don't work.

Now I just plugged in the power to the GPS again.
For 2.6.19.1 I enabled debugging.
In dmesg I see:

pps_core: New message from PID 2423 (flags 0)
pps_core: PPS_FETCH: source 0
pps_core: start sending replay to ID 2423...
pps_core: ... replay sent (180)
pps_core: New message from PID 2423 (flags 0)
pps_core: PPS_FETCH: source 0
pps_core: start sending replay to ID 2423...
pps_core: ... replay sent (180)
pps_core: New message from PID 2423 (flags 0)
pps_core: PPS_FETCH: source 0
pps_core: start sending replay to ID 2423...
pps_core: ... replay sent (180)
pps_core: New message from PID 2423 (flags 0)
pps_core: PPS_FETCH: source 0
pps_core: start sending replay to ID 2423...
pps_core: ... replay sent (180)
pps_core: New message from PID 2423 (flags 0)
pps_core: PPS_FETCH: source 0
pps_core: start sending replay to ID 2423...
pps_core: ... replay sent (180)

I assume this is OK?

Udo


PS: Rodolfo, replay should be corrected into reply.



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