[ntp:questions] More Granularity in the US in the NTP Pool
Richard B. Gilbert
rgilbert88 at comcast.net
Wed Sep 12 01:47:48 UTC 2007
Hal Murray wrote:
>>Suppose a ntpd client can pick up 5 random pool servers, and
>>periodically (say once a day) replace the 'worst' server
>>by randomly picking a new one.
>
>
> I like that suggestion. But, ignoring implementation details,
> how do you decide which of two servers is "better"?
>
> Is a server with 20 ms of jitter all of the time better or
> worse than a server with 10 ms of jitter most of the time but
> 25 ms of jitter for an hour a day?
>
How about the same way ntpd picks them; lowest synchronization distance
wins! Or, since synchronization distance tends to vary with the time of
day (or how busy the network is) the lowest average synchronization
distance over a period of 24 or 48 hours.
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