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#ntp
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Precision timing
11 minThe $20 stratum 1 that chrony kept benching
I built a GPS-disciplined NTP server on a $20 ESP32 with single-nanosecond internal timing. Then chrony refused to use it. The fix was not in the clock. It was in everything I had assumed about serving the time.
#ntp#esp32#gps#timing
Precision timing
10 minThe frozen clock that nobody noticed
A GPS-disciplined NTP server stopped being disciplined, and every monitor stayed green. The giveaway was a freq_ppb value that repeated byte-for-byte across three seconds, which a live servo never does.
#ptp#ntp#gps#linux