[ntp:questions] Very large offset and jitter values after reboot
Richard B. Gilbert
rgilbert88 at comcast.net
Sun Aug 24 19:19:53 UTC 2008
Nicola Berndt wrote:
> I have now successfully set up my machine to use a usb-gpd-mouse to set
> the time. Strangely every time I reboot I get results like this, wich
> settle down after a (not so short) while:
> remote refid st t when poll reach delay offset
> GPS_NMEA(0) .GPS. 0 l 9 64 37 0.000 -580.75
> The problem is, that this takes rather long and the computer's job
> actually is, to provide exact time outdoors right after booting..
> I already tried what would happen if I did a 'hwclock --systohc' once
> things are settled, but with no luck. My driftfile btw. says -35.666 -
> looks good to me - and I am very worried about the huge jitter...
> Any ideas for me, anyone?
> Thx and regards,
> ../nico berndt
1. Don't reboot! My Windows, Linux, Solaris, and OpenVMS systems will
all run until the power goes off for longer than the run time of my UPS.
2. Start ntpd with the "-g" switch. The -g switch tells it to get and
set the correct time. Following startup, ntpd will discipline the clock
in the usual way. It may take a relatively long time, around thirty
minutes, to settle into really tight synchronization.
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