Precision Time Protocol (PTP) and Packet Timestamping in Linux - Antoine Tenart, Bootlin

Time synchronization is important when dealing with transactions, transmissions, logging, etc. on multiple machines and high accuracy can be required. The precision time protocol (IEEE 1588) aims at providing a clock synchronization protocol with an accuracy down to the sub-microsecond range. In this talk we'll see how the protocol works, what are its modes of operations (1-step, 2-step, grand master, etc.) and see what capabilities of the kernel are used, such as packet timestamping. We will also cover how and why timestamping can be offloaded to hardware devices (MAC, PHY, switches), in particular for PTP packets.