[ntp:questions] Is 24PPM an Excessive Real-Time Clock Correction?

Richard B. Gilbert rgilbert88 at comcast.net
Mon Jul 9 14:38:04 UTC 2007


Spoon wrote:
> Richard B. Gilbert wrote:
> 
>> David T. Ashley wrote:
>>
>>> I have ntpd running on a RHEL Linux Dell 1U rack server in another city.
>>>
>>> I have no experience with other servers (to know how accurate the 
>>> clocks are or are not).
>>>
>>> The value of "drift" that gets settled on after a few days is 24 PPM 
>>> (about 14 seconds/week).
>>>
>>> This strikes me as a little high, because even my $20 Timex watch 
>>> does better than this.
>>>
>>> Any insight into whether 24 PPM is excessive for my server?
>>
>>
>> Consider that a computer manufacturer typically spends something like 
>> $2 US on the components for the clock!
> 
> 
> You say "the clock" like as if there were only one.
> 
<snip>
I meant the time of day clock; it's the only one that ntpd concerns 
itself with.  I thought it would be obvious from the context!




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