[ntp:questions] Meinberg NTP monitor, silly question
unruh at wormhole.physics.ubc.ca
Tue Dec 22 20:45:51 UTC 2009
On 2009-12-22, Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
> unruh wrote:
>> On 2009-12-22, Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>> David J Taylor wrote:
>>>> "Richard B. Gilbert" <> wrote in message
>>>> news:ZJydnVuvufm1Wa3WnZ2dnUVZ_h2dnZ2d at giganews.com...
>>>>>> You will find that for the best performance, the NTP PC needs to be
>>>>>> left running, as initial settling is not quick.
>>>>> "Not quick" is an extreme understatement! It takes about 30 minutes
>>>>> to get a "reasonable approximation". It can take ten to twelve hours
>>>>> to stabilize with the best possible approximation of the time. Once
>>>>> there it's good for as long as you can keep the power on and the
>>>>> temperature reasonably stable.
>>>> On one LAN-synced system it took bout 90 minutes to get to within its
>>>> normal offset range, and about the same on a Windows-XP system with a
>>>> GPS reference clock. On the Windows-7 system, with a GPS ref-clock, it
>>>> took about 5 hours.
>>>> I do wish there were some way of speeding this up - a variable loop
>>>> bandwidth or something like that.
>>> Lots of luck. My understanding is that it can't be done without loss of
>>> accuracy and/or stability.
>> Nonsense. chrony does it, without loss of accuracy (chrony is about 3
>> times as accurate as ntp is) or stability. It will correct a few hundred
>> second initial error in far less time than ntp takes for a .01 sec error,
>> and without stepping.
> Then why don't you use chrony and stop bugging us? If it can replace
I do use chrony. Until recently I used ntp for refclock support. I am
not bugging you, just pointing out that the claims made here are
nonesense, by conterexample. I had hoped that ntpd would impliment the
chrony clock discipline algorithm, but it is clear that will not happen.
But this is a newgroup to discuss ntp, not the reference implimentation
of ntpd, and chrony is a program that impliments ntp.
> NTPD under most common scenarios for normal and emergency operation and
> do a better job, I'm sure that it will eventually replace NTPD. Does
> anyone see that happening yet?
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