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The feature is controlled both by a compile-time option in the kernel configuration, CONFIG_MAGIC_SYSRQ, and a sysctl kernel parameter, kernel.sysrq. On newer kernels (since 2.6.12 [ 7 ] ), it is possible to have more fine-grained control over how the magic SysRq key can be used. [ 8 ]
The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.
Clock synchronization is a topic in computer science and engineering that aims to coordinate otherwise independent clocks.Even when initially set accurately, real clocks will differ after some amount of time due to clock drift, caused by clocks counting time at slightly different rates.
Timing synchronization function (TSF) is specified in IEEE 802.11 wireless local area network (WLAN) standard to fulfill timing synchronization among users. A TSF keeps the timers for all stations in the same basic service set (BSS) synchronized. All stations shall maintain a local TSF timer.
The Precision Time Protocol (PTP) is a protocol for clock synchronization throughout a computer network with relatively high precision and therefore potentially high accuracy. In a local area network (LAN), accuracy can be sub-microsecond – making it suitable for measurement and control systems. [ 1 ]
The leader polls the followers who reply with their time in a similar way to Cristian's algorithm. The leader observes the round-trip time (RTT) of the messages and estimates the time of each follower and its own. The leader then averages the clock times, ignoring any values it receives far outside the values of the others.
Cristian's algorithm works between a process P, and a time server S connected to a time reference source. Put simply: P requests the time from S at time t 0. After receiving the request from P, S prepares a response and appends the time T from its own clock. P receives the response at time t 1 then sets its time to be T + RTT/2, where RTT=t 1-t 0.
Rather than broadcasting a timestamp in a synchronization packet as in protocols such as Network Time Protocol, RBS allows the nodes receiving the synchronization packets to use the packet's arrival time as a reference point for clock synchronization. Because most of the non-deterministic propagation time involved in transmitting a packet over ...