How to read CPU temperature on 1100, 2100, and 4200?

OpIT GmbH

We are using NET-SNMP und PRTG

CPU_Temperatur
/sbin/sysctl -n dev.cpu.0.temperature | tr -d C

System_Updates
/usr/local/sbin/pfSense-upgrade -c

Package_Updates
/usr/sbin/pkg upgrade

Joe0x7F

Thanks for the ideas. But, still no luck :(

No “temperature” on my 2100 dashboard.

Version 25.07.1-RELEASE (arm64)
built on Wed Aug 20 8:17:00 EDT 2025
FreeBSD 15.0-CURRENT

https://192.168.1.1/diag_command.php
Shell Output - sysctl dev.cpu.0.temperature
sysctl: unknown oid 'dev.cpu.0.temperature'
Execute Shell Command
sysctl dev.cpu.0.temperature

Shell Output - /sbin/sysctl -n dev.cpu.0.temperature | tr -d C
Execute Shell Command
/sbin/sysctl -n dev.cpu.0.temperature | tr -d C

Shell Output - /usr/local/sbin/pfSense-upgrade -c

Updating repositories metadata...done.
Your system is up to date
Execute Shell Command
/usr/local/sbin/pfSense-upgrade -c

Shell Output - /sbin/sysctl -n dev.cpu.0.temperature | tr -d C
Execute Shell Command
/sbin/sysctl -n dev.cpu.0.temperature | tr -d C

bolded text

SteveITS

@Joe0x7F I don't think the ARM devices have a temperature. It may not be possible for them to get that hot. ;)

It does show on the 4200 though.

Gertjan

@Joe0x7F said in How to read CPU temperature on 1100, 2100, and 4200?:

<NOTHING DISPLAYED>

If nothing comes back, the GUI executes another command.
You tested that one ?

patient0

@Joe0x7F no hardware temperature sensor for 2100 and 1100, as stephenw10 explained in another post (use the search, Luke):

https://forum.netgate.com/post/1016898

stephenw10

Yup that^.

But the 4200 should show the temp of each CPU core. There's a widget you can add to the dash or:

[25.11-BETA][admin@4200.stevew.lan]/root: sysctl -a | grep temperature
hw.acpi.thermal.tz0.temperature: 46.1C
dev.cpu.3.temperature: 41.0C
dev.cpu.2.temperature: 41.0C
dev.cpu.1.temperature: 41.0C
dev.cpu.0.temperature: 42.0C

Joe0x7F

@Gertjan Hmmm... I did not see another command, and I tried this various times and wait times afterward.

Joe0x7F

Thanks, Everyone! I'm trying to get a baseline, so I'll have that information for troubleshooting later.

It may not be possible for them to get that hot. ;)

LOL. Sure.

Gertjan

@Joe0x7F said in How to read CPU temperature on 1100, 2100, and 4200?:

I did not see another command

I'll highlight :

But why looking, as it seems that a RISC processor doesn't have/need a temperature measurement device. These use so little power that they can't heat.

Intel/AMD processors are called "irons" for a reason.

stephenw10

Well I wouldn't agree that they can't get hot enough. They definitely can! But they don't have a sensor that FreeBSD can usefully read.