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Running the CPU constantly at 400MHz is likely to consume more power than bursty workloads at full speed. There are various linked clock domains, and if the CPU
by mjg59 4y ago
Running the CPU constantly at 400MHz is likely to consume more power than bursty workloads at full speed. There are various linked clock domains, and if the CPU cores can't get into low power states then neither can other bits of hardware on the SoC.
- yjftsjthsd-h 4y agoWho says the CPU is running constantly at 400MHz? I assume for video to work at all like that it must by bypassing the CPU, and text editing would look to the machine like "all CPU cores idle... waiting... waiting... oh, the user pressed a button, let's handle that for 50ms, okay now we can idle while we wait for the slow human to press another key..."
- smoldesu 4y agoI'm familiar with the race-to-idle theory, but even on the lowest power mode it will scale between 400-900mhz depending on the workload. If there was anything blocking the CPU or hogging cycles, it would be clocking a bit faster. That being said, it's still not a huge power gain. I mostly do it to keep the system cool and the fan off.