[ntp:questions] time to sync vs ptp?

Rob nomail at example.com
Fri May 31 15:49:39 UTC 2013


matthew.garman at gmail.com <matthew.garman at gmail.com> wrote:
> On Thursday, May 30, 2013 2:21:15 PM UTC-5, Rob wrote:
>> > I have a server running NTP 4.2.2 (as part of the RedHat 5.7 release).  Last night I changed it's /etc/ntp.conf file, specifically the "server xyz" line to point to a new NTP server.
>> 
>> > After doing this, the clock's offset was *increasing* after an hour.  Offset is measured by "ntpdate -q peer".
>> 
>> 
>> This is a wellknown problem.
>> 
>> When you do a couple of ntpd shutdown/restarts e.g. because you
>> 
>> a experimenting with different server configurations, the combination
>> 
>> of ntpd and the kernel goes haywire and it will actually steer the time
>> 
>> the wrong way.
>> 
>> 
>> 
>> Just wait a day or so, and it will have solved itself.
>
>
> Would it be possible to provide a link or point me to some reference material where I can read more about this issue?

I think the issue is never acknowledged by the author.  He believes
his system is proven to be stable.  It is only in practice that we
see this happen, it cannot happen in theory.



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