[ntp:questions] Ginormous offset and slow convergance
unruh at invalid.ca
Wed Nov 30 23:28:22 UTC 2011
On 2011-11-30, Miroslav Lichvar <mlichvar at redhat.com> wrote:
> On Wed, Nov 30, 2011 at 10:24:45PM +0000, unruh wrote:
>> If he has peerstats log file, he can look at it and see what teh offset
>> is of the oncore and the other ntp sources to see if it is really
>> misbehaving that badly. Also, if it is out by 16 sec, why in the world
>> has ntp not stepped the time? The threshold is 128ms.
> I think it did step and more than once. I'd suspect a bug in the
> firmware in the GPS-UTC offset handling, current offset is 15 seconds
> and that is visible in one of the ntpq outputs in the original post.
But how could he get a 16 second offset, after starting out with a .1 s
and 1 s offset. At 500PPM, 16 sec takes 32000 sec (10 hr) to accumulate
which is poll interval 15. Ie, I cannot see how ntpd could have
allowed that huge an offset to occur.
In the posts I saw that all of the sources were off by 16 sec, not just
> Would be interesting to know if this happens on every ntpd restart or
> only shortly after the GPS unit was powered up.
More information about the questions