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I have a project where I need to get the size of the cache on my Linux machine. I don't know the linux distro, and the /etc/os-release file does not exist. I only know the kernel and architecture:

Kernel: Linux 6.1.20-rt8
Architecture: arm64

I cannot install libraries onto the machine.

To get the size of the cache, I tried the following methods, all of which failed:

$ lscpu | grep cache
L1d cache:           unknown size
L1i cache:           unknown size
L2 cache:            unknown size

$ cat /proc/cpuinfo | grep cache
$ 

$ ls /sys/devices/system/cpu/cpu*/cache/index*/size
ls: /sys/devices/system/cpu/cpu*/cache/index*/size: No such file or directory

dmesg | grep -i cache
[    0.000000] Detected VIPT I-cache on CPU0
[    0.000000] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes, linear)
[    0.000000] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
[    0.405602] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.405623] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.490323] Detected VIPT I-cache on CPU1
[    0.508655] Detected VIPT I-cache on CPU2
[    0.526850] Detected VIPT I-cache on CPU3
[    0.547628] Detected PIPT I-cache on CPU4
[    0.591655] Detected PIPT I-cache on CPU5
[    0.762359] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[   22.216417] Detected PIPT I-cache on CPU4
[   22.412738] Detected PIPT I-cache on CPU5

The /proc/cpu info file:

$ cat /proc/cpuinfo
processor       : 0
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 1
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 2
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 3
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd03
CPU revision    : 4

processor       : 4
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 2

processor       : 5
BogoMIPS        : 16.00
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 2

The full lscpu:

$ lscpu
Architecture:        aarch64
Byte Order:          Little Endian
CPU(s):              6
On-line CPU(s) list: 0-5
Thread(s) per core:  1
Core(s) per socket:  6
Socket(s):           1
NUMA node(s):        1
Vendor ID:           ARM
Model:               4
Model name:          Cortex-A53
Stepping:            r0p4
BogoMIPS:            16.00
L1d cache:           unknown size
L1i cache:           unknown size
L2 cache:            unknown size
NUMA node0 CPU(s):   0-5
Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 cpuid
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  • 1
    what kind of CPU does /proc/cpuinfo say you have? (the full cpuinfo and lscpu output would help) Commented Feb 6 at 10:27
  • 2
    and, seeing this is modern multicore machine: which of the several caches do you specifically care about? There isn't "the" CPU cache Commented Feb 6 at 10:27
  • Look at sudo lshw --class cpu. Also your lscpu and other snoopy commands could benefit from running as root, through use of sudo, e.g. sudo lscpu. Read man sudo sudoers. Commented Feb 6 at 15:20
  • hm, are you perhaps running this on virtualized hardware? Commented Feb 6 at 16:50
  • 1
    so, "don't have that software" is easy to solve, and a should really be solved. Commented Feb 12 at 15:01

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