Over these past few weeks, we've updated our Ubuntu 20.04 LTS uptime servers to Ubuntu 22.04 LTS. The reason was mostly just staying up-to-date, but we had a surprising side-effect that was unexpected but very welcome. Measuring reduced CPU usage An easy riddle: can you guess when we were running on Ubuntu 20.04 and when we were on 22.04? The spikes in the middle were during the upgrades (when this server was taken out of rotation). For the exact same workload, here's how the numbers work out...
