Temperature vs time

Funny graph from my computer in a Kansas datacenter. Something changed there and the temperature has dropped 4°C over 12 hours. And just at the same time, the phase-lock loop that NTP uses to sync time with the kernel goes off. The error isn’t big, at most 8ms, but it’s amusing.

sensors_temp-day ntp_kernel_pll_off-day ntp_offset-day