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doc: update description of refclock options

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Miroslav Lichvar 2014-05-22 15:22:24 +02:00
parent 98bbfdf73c
commit a43810533f
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chrony.texi.in
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@ -2586,15 +2586,17 @@ may be defined in any order):
@table @code @table @code
@item poll @item poll
Timestamps produced by refclock drivers are not used immediately, but Timestamps produced by refclock drivers are not used immediately, but
they are stored and processed by a median filter in intervals they are stored and processed by a median filter in the polling interval
specified by this option. This is defined as a power of 2. The specified by this option. This is defined as a power of 2 and may be
negative to specify a sub-second interval. The
default is 4 (16 seconds). A shorter interval allows @code{chronyd} default is 4 (16 seconds). A shorter interval allows @code{chronyd}
to react faster to changes in clock frequency, but it may decrease to react faster to changes in clock frequency, but it may decrease
the accuracy if the source is too noisy. the accuracy if the source is too noisy.
@item dpoll @item dpoll
Some drivers are not controlled by external events and thus require Some drivers don't listen for external events and try to produce
polling. Again this is defined as a power of 2 and can be negative samples in their own polling interval. This is defined as a power of
for sub-second intervals. The default is 0 (1 second). 2 and may be negative to specify a sub-second interval. The default
is 0 (1 second).
@item refid @item refid
This option is used to specify a reference id of the refclock, as up This option is used to specify a reference id of the refclock, as up
to four ASCII characters. By default, first three characters from to four ASCII characters. By default, first three characters from
@ -2630,7 +2632,7 @@ having no majority in the algorithm or to make it prefer other
sources. The default is 1e-9 (1 nanosecond). sources. The default is 1e-9 (1 nanosecond).
@item precision @item precision
Refclock precision (in seconds). The default is 1e-6 (1 microsecond) Refclock precision (in seconds). The default is 1e-6 (1 microsecond)
for SHM refclock, and 1e-9 (1 nanosecond) for SOCK and PPS refclocks. for SHM refclock, and 1e-9 (1 nanosecond) for SOCK, PPS and PHC refclocks.
@item prefer @item prefer
Prefer this source over sources without prefer option. Prefer this source over sources without prefer option.
@item noselect @item noselect