doc: improve description of refclock filter option

This commit is contained in:
Miroslav Lichvar 2023-02-02 15:05:05 +01:00
parent ecfbde9872
commit 221e5fb501

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@ -642,7 +642,9 @@ noise in the measurements. With each poll about 40 percent of the stored
samples are discarded and one final sample is calculated as an average of the
remaining samples. If the length is 4 or more, at least 4 samples have to be
collected between polls. For lengths below 4, the filter has to be full. The
default is 64.
default is 64. With drivers that perform their own polling (PPS, PHC, SHM), the
maximum value is adjusted to the number of driver polls per source poll, i.e.
2^(_poll_ - _dpoll_).
*prefer*:::
Prefer this source over sources without the prefer option.
*noselect*:::