Identify CPU clock speed when its not visible under different commands like lscpu ?
In this article, we will see how to check CPU clock speed on Linux or Unix servers when its not visible under different commands.
1. Check CPU Info
[root@ngelinux001~]# cat /proc/cpuinfo | head processor : 0 BogoMIPS : 400.00 Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics cpuid asimdrdm CPU implementer : 0x43 CPU architecture: 8 CPU variant : 0x1 CPU part : 0x0af CPU revision : 1
2. List all CPUs
[root@ngelinux001~]# lscpu Architecture: aarch64 Byte Order: Little Endian CPU(s): 224 On-line CPU(s) list: 0-223 Thread(s) per core: 4 Core(s) per socket: 28 Socket(s): 2 NUMA node(s): 2 Model: 1 BogoMIPS: 400.00 L1d cache: unknown size L1i cache: unknown size L2 cache: unknown size L3 cache: unknown size NUMA node0 CPU(s): 0-111 NUMA node1 CPU(s): 112-223 Flags: fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics cpuid asimdrdm [root@ngelinux001~]#
3. Using dmidecode
As we can see above the CPU frequency is not visible in above two commands.
Hence the useful command now is dmidecode which shows all hardware configuration of the server.
[root@ngelinux001~]# dmidecode | grep -iB5 mhz
Family: ARM
Manufacturer: NGEL Inc.
ID: F1 0A 1F 43 00 00 00 00
Version: NGEL ThunderX2(R) CPU CN9975 v2.1 @ 2.0GHz
Voltage: 0.8 V
External Clock: 33 MHz
Max Speed: 2500 MHz
Current Speed: 2000 MHz
I hope you liked the trick, sometimes its confusing that why the CPU frequency is not visible in lscpu and cpuinfo commands.