It is with great pleasure that the PTPd team announces the official release of PTPd v 2.3.0.

There are several advances in this release including:

• IEEE 802.3 Support

• Support for reading from the Berkeley Packet Filter, resulting in lower jitter

• Configuration file support, multiple previously unsupported options

• Full help (-H) for all configuration options,

• Configuration reload support with SIGHUP,

• Rewritten logging subsystem,

• Support for tick adjustment as well as frequency

• maximum frequency offset is now configurable and can be above 512 ppm - tick is used above 512 ppm,

• Added a compatibility option to always honour the UTC offset announced by a GM when in slave state

• Support for RTC clock control on Linux

• Extensive support for realtime statistics

  • online long term statistics and moving statistics

  • mean and std dev.

  Some new features included depend on statistics support, enabled with the --enable-statistics configure switch. Statistics rely on double precision so may be disabled for simple embedded systems

• Outlier filters based on Peirce’s criterion
  blocks / filters spikes from delayMS and delaySM

• Generic PI controler model

• P and I components changed from attenuations to gains

• Double precision servo allows for tighter clock control

• Clock stabilisation detection based on the standard dev of observed drift

• Clock “calibration delay” - allows a configurable delay between seeing a GM for the first time and enabling clock control

• Support for “panic mode” - if ptpd sees offset from master above 1 second, it will pause clock updates for a given amount of time

• NTPd integration and failover
  ptpd can now connect to local ntpd using mode 7 packets (code derived from ntpdc)
  and using authenticated requests can enable/disable ntpd clock control.
  Enable with configure --enable-ntpdc

• Dump counters + clear counters using a SIGUSR2 handler to dump all counters to the log file
  configure --enable-sigusr2=counters

• Support for ACLs for management and timing messages

• Basic support for SO_TIMESTAMPING (RX, TX) on Linux

• Support for non-Ethernet interfaces on Linux (Infiniband, GRE etc.)

• Support for offset / delay asymmetry correction

• Ptpd can now prefer or require GMs with valid UTC time

• Support for setting IP DSCP values

• Periodic IGMP joins also in master mode - improved robustness against network port failures

• Support for binding PTPd to a CPU core

• Control over tick rate on Linux, allowing faster clock slewing if needed

The full list of new features and bugs fixed are in the ChangeLog.

Best,
The PTPd Team