Preempt doesnt work with 32bit userland 64bit kernel

[puccaso]

Hey guys,

the preempt feature doesn't seem to work with 32bit userland 64bit kernel on raspberry pi os / rpi 4b. when i use with the preempt, everything is ok but even though th preempt option doesn't give me errors, when i go over the temperature threshold, it the fan does not kick in.

and i'm running on a headless system - so if i hadn't randomly VNCd into the machine i wouldn't have seen the temp warning!

any idea how to fix?

puc

[Gadgetoid]

This would imply that psutil.cpu_freq() does not return the correct current frequency.

You could probably verify that by running the following both during idle, and during some load (like sysbench --test=cpu --cpu-max-prime=20000 run):

import psutil
import time

time.sleep(1.0)
print(psutil.cpu_freq().current)

On my Pi 4 with stock Raspberry Pi OS, kernel 5.4.51 this will show 600 at idle and 1500 at load, it's this transition that pre-empt uses to try and kick in cooling before the CPU actually starts to heat up.

In all cases, though, as soon as the system does heat up and exceed the temperature threshold, the cooling should kick in so something else is amiss here.

[scollar71]

Just purchased an Argon 1 M.2 (Yet to recieve) I believe it uses a identical setup as Pimoroni(?) has there been any work to adapt to 64bit OS's. Currently loving the lineage OS 17.1 Android 10 TV setup on my pi 4b am I going to have headaches with that OS?