[mythtv-users] NTP drift...

White Joe joe.white at consultant.volvo.com
Thu Oct 12 12:42:49 UTC 2006


 

> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Romain Kang
> Sent: Wednesday, October 11, 2006 5:40 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] NTP drift...
> 
> I'm sure the NTP mavens will come out of the woodwork to correct
> me, but I would check a few things:
> 
> - Could you send the output of "ntpq -p" so that others can see that
>   it's sane?
> 
> - Does the ntp drift file have a reasonable value?
> 
>   If its value is maxed out at +/- 500 ppm, that can keep your
>   system converging even if it makes big step corrections several
>   times a day.
> 
>   A high value (say, over +/- 200 ppm) may indicate hardware problems
>   of some kind.  Sometimes it just means that NTP got confused because
>   of weird conditions.  Removing ntp.drift and restarting the daemon
>   may get it retrained to a good range.
> 
> - Is /var/log/messages recording anything from the ntpd process?
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> 
I am seeing a similar issue, though more extreme.  The computer adds
about 35 extra seconds each hour.  If I restart the daemon or run
ntpdate then it corrects itself, but the daemon will not maintain the
time automatically.  Hopefully I will get a chance to troubleshoot it
this weekend.


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