NTP Timekeeping - notes, overview, the best or the rest

FreeBSD
	Pixie Linux 3.2.63-2 GPS-18 puck roof-mounted kernel-mode PPS-synced NTP
Linux Raspberry Pi 1
	Raspberry Pi 1 Linux 3.6.11 Adafruit MTK3339 RX in unheated cupboard kernel-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 3
	Raspberry Pi 3 Linux 3.6.11 #2 U-blox 6M module Puck antenna RX indoors kernel-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 4
	Raspberry Pi 4 Linux 3.6.12.35+ #730 U-blox 5S module Puck antenna RX indoors kernel-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 5
	Raspberry Pi 5 Linux 3.6.11 #2 U-blox 7Q module on Raspberry Pi GPS Addon Board Puck antenna RX indoors kernel-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 6
	Raspberry Pi 6 Linux 3.12.35+ #730 Was: U-blox 7Q module on Raspberry Pi GPS Addon Board Puck antenna RX indoors kernel-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 7
	Raspberry Pi 7 Linux 3.12.34+ #727 U-blox 7Q module on Raspberry Pi+ GPS Expansion Board Puck antenna RX indoors user-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 8
	Raspberry Pi 8 Linux 3.18.5-v7+ #746 U-blox 7Q module on Raspberry Pi+ GPS Expansion Board Puck antenna RX indoors user-mode PPS-synced NTP (transients removed)
Linux Raspberry Pi 9
	Raspberry Pi 9 Linux 3.18.5-v7+ #746 U-blox M8Q module on Raspberry Pi+ GPS Expansion Board Puck antenna RX indoors user-mode PPS-synced NTP (transients removed)

Other periods: day week month year

Network configuration
NTP event log

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