[LinuxPPS] time_pps_kcbind return EOPNOTSUPP

[William S. Brasher]

On Mon, 31 May 2010, Udo van den Heuvel wrote:

> 
> So it looks better (time-wise) but ntptime still shows `error`.
> The error has to go away. Error is not there as long as ntpd is
> starting, then status is OK. When local PPS is entering the game, the
> status becomes error.
> 
> So what is the next step?
> 
> I am also in #ntp on freenode.
> 
> Udo
> 
> 


I am running linux 2.6.34 and ntp 4.2.6 with no additional patches; my gps 
clock is a Garmin 18 lvc that is inside the house.  It does lose sync with 
the gps constellation every once in a while.  

My experience is that ntp will sync initially with gps, lose sync after a 
time and reject all sources of time, and then after a few hours finally 
start accepting the gps time again.  I've just gotten used to waiting for 
a while for ntp to get in sync.  Once it does get in sync it seems to 
follow temperature changes and gps signal loss ok.

For what it is worth, I have a 64 bit machine configured with HZ=100 and 
CONFIG_NO_HZ not set; there is also have a 32 bit machine configured with 
HZ=1000 and CONFIG_NO_HZ=y.  Both machines seem to behave about the same, 
though it does seem the 1000 hz box follows temperature changes a little 
better.