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