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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
@item poll
Timestamps produced by refclock drivers are not used immediately, but
they are stored and processed by a median filter in intervals
specified by this option. This is defined as a power of 2. The
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 and may be
negative to specify a sub-second interval. The
default is 4 (16 seconds). A shorter interval allows @code{chronyd}
to react faster to changes in clock frequency, but it may decrease
the accuracy if the source is too noisy.
@item dpoll
Some drivers are not controlled by external events and thus require
polling. Again this is defined as a power of 2 and can be negative
for sub-second intervals. The default is 0 (1 second).
Some drivers don't listen for external events and try to produce
samples in their own polling interval. This is defined as a power of
2 and may be negative to specify a sub-second interval. The default
is 0 (1 second).
@item refid
This option is used to specify a reference id of the refclock, as up
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).
@item precision
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
Prefer this source over sources without prefer option.
@item noselect