---
name: "x86info"
section: "1"
platform: "linux"
package: "x86info"
version: "1.31~pre0.8052aabdd159bc9050e7dc264f33782c5acce05f-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/x86info"
---

# x86info(1)

display x86 CPU diagnostics

## NAME

x86info — display x86 CPU diagnostics

## SYNOPSIS

**x86info** \[**-a**\]  \[**-c**\]  \[**-f**\] \[fB-F**\]  \[-m\] \[-mhz\]  \[-r\]  \[?\]  \[--all\]  \[--cache\] \[--flags\] \[--verbose\]  \[--msr\]  \[--mhz\]  \[--registers\]  \[--help\]**

## DESCRIPTION

**This manual page documents x86info, a**  **program which displays a range of information about the CPUs**  **present in an x86 system.**

**In order to make full use of this program you need to have the CPU ID** **and MSR device drivers in your kernel with accessible device files** **/dev/cpu/\<n\>/cpuid and /dev/cpu/\<n\>/msr.**

## OPTIONS

**This program follows the usual GNU command line syntax, with**  **long options starting with two dashes (\`-').  A summary of options**  **is included below.**

- **?** **--help**

  **Show summary of options.**

- **-a** **--all**

  **Show all information.  Equivalent to**  **-c -f -m 	    -r -mhz.**

- **-c** **--cache**

  **Show TLB, cache sizes and cache associativity.**

- **-f** **--flags**

  **Show CPU feature flags.**

- **-m** **--msr**

  **Dump model specific registers.  This feature is currently only**  **supported on a few different processors. Future versions will** **include parsing of bits in MSRs for all processors.**

- **-mhz** **--mhz**

  **Estimate current clock rate.**

- **-mp** **--mptable**

  **Dump MP table showing CPUs BIOS knows about.**

- **-r** **--registers**

  **Show register values from all possible cpuid calls.**

- **-s** **--show-machine-check**

  **Show machine check exception information.**

- **-v** **--verbose**

  **Show verbose descriptions.**

## AUTHOR

**x86info was written by Dave Jones**  **\<davej@redhat.com\>.**

**This manual page was written by Mark Brown \<broonie@debian.org\> for**  **the Debian GNU/Linux system (but may be used by others).**

**Permission is granted to copy, distribute and/or modify this**  **document under the terms of the GNU General Public License version 2.**