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Add test for ratio of increase in delay to stddev

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Require that the ratio of the increase in delay from the minimum one in
the stats data register to the standard deviation of the offsets in the
register is less than maxdelaydevratio or the difference between
measured offset and predicted offset is larger than the increase in
delay. In the allowed delay increase is included also skew and maximum
clock frequency error.

maxdelaydevratio is 10.0 by default.
This commit is contained in:
Miroslav Lichvar
2010-12-03 18:35:33 +01:00
parent feb8811f37
commit b977c95be4
12 changed files with 112 additions and 9 deletions
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14
chrony.texi
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@@ -1828,7 +1828,7 @@ An example line (which actually appears as a single line in the file)
from the measurements log file is shown below.
@example
1998-07-22 05:40:50 158.152.1.76 N 8 1111 11 1111 10 10 1 \
2010-12-22 05:40:50 158.152.1.76 N 8 1111 111 1111 10 10 1.0 \
-4.966e-03 2.296e-01 1.577e-05 1.615e-01 7.446e-03
@end example
@@ -1837,7 +1837,7 @@ values from the example line above) :
@enumerate 1
@item
Date [1998-07-22]
Date [2010-12-22]
@item
Hour:Minute:Second [05:40:50]. Note that the date/time pair is
expressed in UTC, not the local time zone.
@@ -1853,8 +1853,8 @@ Stratum of remote computer. [2]
@item
RFC1305 tests 1 through 4 (1=pass, 0=fail) [1111]
@item
Tests for maximum delay and maximum delay ratio, against user defined
parameters (1=pass, 0=fail) [11]
Tests for maximum delay, maximum delay ratio and maximum delay dev ratio,
against defined parameters (1=pass, 0=fail) [111]
@item
RFC1305 tests 5 through 8 (1=pass, 0=fail) [1111]
@item
@@ -2595,6 +2595,12 @@ measurements that it has buffered. If a measurement has a round trip
delay that is greater than the maxdelayratio times the minimum delay, it
will be rejected.
@item maxdelaydevratio
If a measurement has ratio of the increase in round-trip delay from
the minimum delay amongst the previous measurements to the standard
deviation of the previous measurements that is greater than
maxdelaydevratio, it will be rejected. The default is 10.0.
@item presend
If the timing measurements being made by @code{chronyd} are the only
network data passing between two computers, you may find that some