[ntp:questions] Loopstats update - how often?
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Thu Mar 15 17:04:08 UTC 2012
"unruh" <unruh at invalid.ca> wrote in message
news:Fdo8r.12214$v11.9222 at newsfe20.iad...
> The clock filter selects the data with the smallest round trip time, to
> fix the problem with asymmetric round trips (on the theory tht the
> shortest time is more likely to be symmetric round trip).
> The filter is 8 items deep, and thus on average it selects the same item
> the whole time it is in the clock filter. Ie, on average a bit less than
> 7 out of 8 inputs are thrown away (it is actually avout 80% that are
> thrown away).
> This is for network polled items where round trip time makes sense. For
> refclocks about 40% are thrown away to get rid of "popcorn" deviations.
> (non-gaussian large offsets) as I understand it.
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