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/* -*- Mode: Text -*- */
AutoGen Definitions perlopt;
#include autogen-version.def
prog-name = calc_tickadj;
prog-title = 'Calculates "optimal" value for tick given ntp drift file.';
package = ntp;
#include version.def
long-opts;
gnu-usage;
flag = {
name = drift-file;
value = d;
arg-type = string;
arg-default = '/etc/ntp/drift';
descrip = 'Ntp drift file to use';
doc = 'Use the specified drift file for calculations';
};
flag = {
name = tick;
value = t;
arg-type = number;
descrip = 'Tick value of this host';
doc = 'The current tick which to adjustment will be calculated';
};
doc-section = {
ds-type = 'DESCRIPTION';
ds-format = 'texi';
ds-text = <<- _EndOfDoc
The @code{calc_tickadj} script uses provided ntp drift file to generate optimal
tick value. Generally, ntpd can do better job if the drift value is the
smallest possible number.
The example output of
@example
$ ./calc_tickadj
81.699 (drift)
9999 usec; 9999779 nsec
$ cat /etc/ntp/drift
-23.159
@end example
means the following. If tick on that box is 10,000, by making the value 9999
we'll shift the box from its current drift of -23.159 to a drift of 81.699, and
in doing so we'll speed the clock up a little every second instead of slowing
the clock down a little.
If 'tick' on that box is 10,000,000 then by setting it to 9999779 the drift
value will be somewhere around 0.0.
@code{calc_tickadj} tries to determine the the tick value by using
@code{tickadj} program from ntp package. If this doesn't work you can specify
current tick manually on command line.
_EndOfDoc;
};
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