[time] outlier

Tim Shoppa shoppa
Thu Nov 2 12:17:07 UTC 2006


"David J Taylor" <david-taylor at blueyonder.co.uk> wrote:
> It's where one system is grossly different to all the rest.  Suppose that 
> you had 10 server.  Your offsets with 9 servers are in the range -0.1s to 
> +0.1s, but one server shows an offset of 0.9s.  It would be the 
> "outlier" - something which lies outside the rest.

"Yeahbut" - NTP is particularly aggressive about marking servers
as outliers, especially when it has a large number of servers to
choose from. It can afford to be picky. It's usually not worth
getting worked up about an outlier or two as being a bad server.

In most (but not all!) cases transient outliers are the result
of variable network latency.

Tim.


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