Before calculating the clock drift in the PI servo, make sure
the first sample is older than the second sample to avoid getting
invalid drift or NaN.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Similarly to the servo in phc2sys, when clock is stepped, set
immediately also its frequency. This significantly improves the initial
convergence with large frequency offsets.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Current date stored in nanoseconds doesn't fit in 64-bit double format.
Keep the offset and the time stamp in integer nanoseconds.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Make it easier to find out the compiled-in defaults in the code
and set all options in default.cfg.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
this patch modifies the pi servo to add a configurable max offset (default
infinity). When ever the detected offset is larger than this value, the clock
will jump and reset the servo state. The value of this feature is for decreasing
time to stabalize when clock is off by a large ammount during late running. This
can occur when the upstream master changes, or when the clock is reset due to
outside forces. The method used to reset clock is simply to reset the pi servo
to the unlocked state.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
If software time stamping is to be used, then the servo will want to
have appropriate filtering.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Miroslav Lichvar
Jacob Keller
Richard Cochran