Move the implementation of the median filter to a separate file to make
it useful for NTP. Replace some constants with parameters and generalize
the code to work with full NTP samples (including root dispersion/delay,
stratum, and leap).
For refclocks it should give the same results as before.
Instead of using the TAI-UTC offset which corresponds to the current
system time, get the offset for the reference time. This allows the
clock to be accurately stepped from a time with different TAI-UTC
offset.
This option is for indicating to chronyd that the reference clock is
kept in TAI and that chrony should attempt to convert from TAI to UTC by
using the timezone configured by the "leapsectz" directive.
If the minimum delay is known (in a static network configuration), it
can replace the measured minimum from the register. This should improve
the stability of corrections for asymmetric jitter, sample weighting and
maxdelay* tests.
Add width option to the refclock directive to set expected width of
pulses in a PPS signal. The width adds a limit for the maximum offset
and root distance in order to reject PPS samples from wrong events, e.g.
PHCs which cannot be configured to timestamp only rising of falling
edges.
Add extpps driver option to the PHC refclock to enable external
timestamping of PPS signal and also options to configure the channel and
pin index. In this mode, the driver polling function accumulates samples
for hwclock, which is used to convert received timestamping events to
local time.
Add pps option to the refclock directive to force chronyd to treat any
refclock as a PPS refclock. This is intended for refclocks that may
provide time off by a whole number of seconds due to missing or wrong
TAI/GPS->UTC conversion.
Split RCL_AddPulse() in order to provide a new function for refclock
drivers which can make PPS samples without having raw system time, e.g.
from PHC timestamps.
It was never used for anything and messages in debug output already
include filenames, which can be easily grepped if there is a need
to see log messages only from a particular file.
The maxlockage option specifies in number of pulses how old can be
samples from the refclock specified by the lock option to be paired with
the pulses. Increasing this value is useful when the samples are
produced at a lower rate than the pulses.
If all or most SHM/SOCK samples collected in a polling interval had the
same local timestamp, the dispersion could end up as nan, which could
trigger an assert failure later in the code.
Before accumulating a refclock sample, check if the timestamp is newer
than the previous one.
Replace struct timeval with struct timespec as the main data type for
timestamps. This will allow the NTP code to work with timestamps in
nanosecond resolution.
Change the array with refclock instances to store just pointers and
avoid reallocation of the instances. This fixes a bug with the SOCK
refclock, which uses the pointer to the instance in a file handler and
which was invalid when the instance was reallocated (after adding
another refclock).
The bug is from commit d92583ed33.
If local reference is active, return normal leap, but unsynchronised
status. Update the callers of the function to work with the leap
directly and not change their behaviour.
REF_IsLocalActive() is no longer needed.
The minsamples and maxsamples directives now set the default value,
which can be overriden for individual sources in the server/peer/pool
and refclock directives.
This should reduce the number of possible memory leaks reported by
valgrind. The remaining reported leaks are sched tqe allocation, async
DNS instance allocation, cmdmon response/timestamp cell allocation, and
clientlog subnet allocation.
Add a new change type and use it when an unexpected time jump is
detected in the scheduler to reset reference times, offset and slewing,
NCR instances (with their polling interval), synchronization status, and
drop all sourcestats, manual, refclock and RTC samples.
This should make the recovery more graceful if the estimated jump has a
large error (e.g. select didn't timeout, or after system suspend).
The dispersion of refclock samples before filtering now includes only
offset correction error and precision.
This should fix a problem where locked PPS got stuck with large average
dispersion and didn't accept new samples due failing check of offset
and dispersion.
