[ntp:questions] NTP vs chrony comparison (Was: oscillations in ntp clock synchronization)

Richard B. Gilbert rgilbert88 at comcast.net
Fri Jan 25 19:45:10 UTC 2008

David Woolley wrote:
> David L. Mills wrote:
>> 5. This flap about the speed of convergence has become silly. Most of 
>> us are less concerned about squeezing to the low microseconds in four 
> Have you done the market surveys to confirm this?  I don't have the 
> resources or time to do that, but my impression from the sort of 
> questions that appear on this newsgroup is that most IT managers and 
> turnkey system developers who want better than 100ms clock accuracy want 
> one or both of:
> - fast convergence (small compared with overall bootup time) - a
>   a common case, these days, is that they are not allowed to process
>   financial transactions until convergence is complete;
> - strict monotonicity.

ISTR that time stamps on financial transactions are required to be 
within two seconds of the correct time.  With NTP that standard is not 
too difficult to meet.

Other applications might be far more demanding.

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