My system clock is about 2m ahead of real time. I'm about to fix it, but decided to run hwclock -c just for fun. My results:
hw-time system-time freq-offset-ppm tick 1542485037 1542484930.078367 1542485047 1542484940.080521 215 2 1542485057 1542484950.080867 125 1 1542485067 1542484960.081214 95 1 1542485077 1542484970.081584 80 1 1542485087 1542484980.081927 71 1 1542485097 1542484990.082279 65 1 1542485107 1542485000.082645 61 1 1542485117 1542485010.082970 58 1 1542485127 1542485020.083356 55 1 1542485137 1542485030.083710 53 1 1542485147 1542485040.084061 52 1 1542485157 1542485050.084418 50 1 1542485167 1542485060.084741 49 0 1542485177 1542485070.085071 48 0 1542485187 1542485080.085395 47 0 1542485197 1542485090.085705 46 0 1542485207 1542485100.086030 45 0 1542485217 1542485110.086376 44 0 1542485227 1542485120.086734 44 0 1542485237 1542485130.087069 44 0 1542485247 1542485140.087428 43 0 1542485257 1542485150.087774 43 0 1542485267 1542485160.088111 42 0 1542485277 1542485170.088472 42 0 1542485287 1542485180.088818 42 0 1542485297 1542485190.089151 41 0 1542485307 1542485200.089468 41 0 1542485317 1542485210.089789 41 0 1542485327 1542485220.090126 41 0 1542485337 1542485230.090476 40 0
I understand the first two columns (Unix time for the hardware and system clocks), but what do the freq-offset-ppm and tick columns, both of which appear to decrease the longer I run hwclock -c, mean?
Google was unhelpful. Some of the pages that talk about hwclock -c have an output like the one above, but don't actually explain it.
Looks like it was basically some non-sense values. The option is now being removed:
https://github.com/karelzak/util-linux/commit/92931ab28d2f9174b884b4373d6cdd1e0ef350d4