FreeBSD CPU Information Command

September 8, 2019

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How do I get more information about CPU under FreeBSD operating systems such as CPU Speed and model?

You can use the dmesg utility displays the contents of the system message buffer when FreeBSD comes up. For accuracy I recommend querying /var/run/dmesg.boot file. Usually a snapshot of the buffer contents taken soon after file systems are mounted at startup time and dumped to /var/run/dmesg.boot file.

Check CPU Speed in FreeBSD using sysctl command

Type the following command at a shell prompt as root user:
# sysctl -a | egrep -i 'hw.machine|hw.model|hw.ncpu'
# sysctl hw.model hw.machine hw.ncpu
Sample outputs:

hw.machine: amd64
hw.model: Intel(R) Xeon(R) CPU           X3220  @ 2.40GHz
hw.ncpu: 4
hw.machine_arch: amd64

From the outputs, I’ve an Intel Xeon quad core processor running at 2.40GHz. Here is another output from my FreeBSD based firewall server:

Fig. 01: Finding out CPU info on a FreeBSD server/router

FreeBSD CPUINFO using the dmesg command

Type the following command:
# dmesg | grep -i cpu
Or directly query /var/run/dmesg.boot file:
# grep -i cpu /var/run/dmesg.boot
Sample outputs:

CPU: Dual Core AMD Opteron(tm) Processor 170 (1999.08-MHz 686-class CPU)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
cpu0:  on acpi0
acpi_throttle0:  on cpu0
cpu1:  on acpi0
acpi_throttle1:  on cpu1
SMP: AP CPU #1 Launched!

You can also dump more information using sysctl command:
# sysctl -a | grep -i cpu | less

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.