On Tue, 07 Dec 2021 13:03:07 +0530, Muni Sekhar said: > Which module is responsible for resulting in the absolute time? Is > absolute time synchronized across multiple systems connected on the > network? man -k ntp Keeping the system clock in sync with external timesources and reality is too complicated and messy to be done inside the kernel, so it's usually done with a userspace daemon which on Linux boxes is usually ntpd. Depending on the clock stability of the hardware, whether you have an RTC chip that keeps track of time even when powered down, and the timing tolerances you want on your network (synced to the same minute, or same second, or same 0.001 seconds), it may be sufficient to run ntpdate at an appropriate time during system boot, or from inside a cron job, or you may want to have a continually running ntpd process. Most sane distros have ntpd enabled by default with a reasonable set of defaults - systems that have non-broken clocks will fairly quickly figure out the clock drift rate, and your network load to keep the clocks within a few milliseconds of a national time standard drops to a few packets every 20 minutes or so. In case of a network outage, it will continue to correct the system clock according to the last known drift rate. And if you need better than millisecond sync, you're going to be springing for a GPS receiver with a PPS output and/or a cesium or rubidium clock. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
