High CPU Spikes about Every 2 Hours & Persistent Unknown Zigbee Nodes after Network Reset

[Peter_Kawa]

Possibly be due to a recent Homey update to a new Debian version

Sudden CPU frequency drop from 1.3GHz to 0.9GHz since v13.3.0

I quickly checked with the team, and the most likely explanation is that the move to the Debian Bookworm base also changed the CPU frequency governor. On Debian Bullseye, the default governor was typically ondemand, whereas newer kernels used by Debian Bookworm generally default to schedutil. The main difference is that schedutil adjusts the CPU frequency much more dynamically based on the scheduler, while ondemand periodically samples CPU utilization and often keeps the CPU at higher frequenci…

Sudden CPU frequency drop from 1.3GHz to 0.9GHz since v13.3.0

I understand why it looks that way, but that’s not quite how it works. The CPU isn’t simply being “fed less power.” Modern SoCs continuously adjust both their clock speed and voltage based on the current workload. When there’s little work to do, the CPU runs at a lower frequency and voltage to save power. As soon as more performance is required, the governor increases the frequency again. It’s also important to distinguish between CPU utilization and CPU performance. Running at a lower frequen…