FreeBSD find CPU (processor) temperature command

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FreeBSD find CPU (processor) temperature command

I am a new FreeBSD Unix user. How do I get the temperature of an Intel or AMD processor (CPU) in FreeBSD using command line option? Is there a command line option for determining CPU temperature on FreeBSD Unix operating system?You can read data from FreeBSD kernel using any one the following method. Freebsd check cpu temperature with the following commands:

You must enable coretemp device driver for Intel based cpu for digital thermal sensor. See below how to load the driver as a module at boot time using /boot/loader.conf file on a FreeBSD to get CPU temperature. The coretemp driver reports each CPU core’s temperature through a sysctl command.

A note about AMD cpus

You need to use the amdtemp device driver for AMD processor on-die digital thermal sensor.

How to determine CPU temperature on FreeBSD

You just need to type the following command to see cpu temperature in FreeBSD operating system:

$ sysctl -a | grep temperature

OR

$ sysctl dev.cpu | grep temperature

Sample outputs:



How to load coretemp or amdtemp driver at boot time

For Intel based cpu you need to load or use coretemp driver. To load the driver as a module at boot time, append the following line in loader.conf(5):

# vi /boot/loader.conf

Append the following for Intel CPUs:

coretemp_load="YES"

Append the following if you are using AMD CPUs:

amdtemp_load="YES"

Save and close the file. To load the driver without rebooting the box, enter:

# kldload coretemp

OR for AMD CPUs:

# kldload amdtemp

Once loaded you can verify it with dmesg command

# dmesg | tail -10

Sample outputs:

igb0: link state changed to UP arp: 192.168.2.254 moved from 20:5c:24:70:00:f8 to 00:08:a2:0a:ba:b8 on igb0 coretemp0: <CPU On-Die Thermal Sensors> on cpu0 coretemp1: <CPU On-Die Thermal Sensors> on cpu1 coretemp2: <CPU On-Die Thermal Sensors> on cpu2 coretemp3: <CPU On-Die Thermal Sensors> on cpu3 coretemp4: <CPU On-Die Thermal Sensors> on cpu4 coretemp5: <CPU On-Die Thermal Sensors> on cpu5 coretemp6: <CPU On-Die Thermal Sensors> on cpu6 coretemp7: <CPU On-Die Thermal Sensors> on cpu7

Now to determine your CPU temperature on FreeBSD, type:

# sysctl -a | grep -i temperature

Sample output from Intel Xeon E3-1285L v4 CPU:

hw.acpi.thermal.tz1.temperature: 29.9C hw.acpi.thermal.tz0.temperature: 27.9C dev.cpu.7.temperature: 41.0C dev.cpu.6.temperature: 41.0C dev.cpu.5.temperature: 40.0C dev.cpu.4.temperature: 40.0C dev.cpu.3.temperature: 41.0C dev.cpu.2.temperature: 41.0C dev.cpu.1.temperature: 40.0C dev.cpu.0.temperature: 40.0C

A note about ipmitool

To see detailed sensor information use ipmitool (Intelligent Platform Management Interface) command as follows on your FreeBSD based server:

# ipmitool sensor

Sample outputs:

ATX+5VSB | 5.070 | Volts | ok | 4.230 | 4.710 | na | na | 5.550 | 5.610 +3VSB | 3.500 | Volts | ok | 2.780 | 2.820 | na | na | 3.660 | 3.680 Vcore | 0.830 | Volts | ok | 0.540 | 0.560 | 0.600 | 1.490 | 1.560 | 1.640 VCCM | 1.350 | Volts | ok | 1.090 | 1.120 | na | na | 1.720 | 1.750 +1.1 | 1.090 | Volts | ok | 0.850 | 0.890 | 0.940 | 1.150 | 1.210 | 1.270 +1.0 | 1.020 | Volts | ok | 0.850 | 0.890 | 0.940 | 1.150 | 1.210 | 1.270 BAT | 3.200 | Volts | ok | 2.380 | 2.500 | na | na | 3.580 | 3.680 +3V | 3.300 | Volts | ok | 2.780 | 2.820 | na | na | 3.660 | 3.680 +5V | 5.010 | Volts | ok | 4.230 | 4.710 | na | na | 5.550 | 5.610 +12V | 12.200 | Volts | ok | 10.100 | 10.300 | na | na | 13.300 | 13.400 CPU_FAN1 | na | RPM | na | na | na | 100.000 | na | na | na REAR_FAN1 | na | RPM | na | na | na | 100.000 | na | na | na FRNT_FAN1 | na | RPM | na | na | na | 100.000 | na | na | na FRNT_FAN2 | na | RPM | na | na | na | 100.000 | na | na | na REAR_FAN2 | 1200.000 | RPM | ok | na | na | 100.000 | na | na | na CPU_FAN2 | na | RPM | na | na | na | 100.000 | na | na | na MB Temperature | 55.000 | degrees C | ok | na | na | na | 80.000 | na | na CPU Temperature | 52.000 | degrees C | ok | na | na | na | 80.000 | 85.000 | 90.00

Conclusion

You just learned how to check cpu temperature on a FreeBSD based system. For more info see coretemp docs here/here and read the man pages by typing the following man command:

$ man 4 coretemp # <- for INTEL cpus

$ man 4 amdtemp # <- for AMD cpus

$ man 8 sysctl