From 221e5fb5011594d12fa4b6e5f851dc70d0ae4775 Mon Sep 17 00:00:00 2001 From: Miroslav Lichvar Date: Thu, 2 Feb 2023 15:05:05 +0100 Subject: [PATCH] doc: improve description of refclock filter option --- doc/chrony.conf.adoc | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/doc/chrony.conf.adoc b/doc/chrony.conf.adoc index a214898..f4dff33 100644 --- a/doc/chrony.conf.adoc +++ b/doc/chrony.conf.adoc @@ -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*:::