Linux Find Out CPU Support 36-bit Physical Addressing Or Not

To find out if your CPU supports 36-bit physical addressing, you can check the flags section in the /proc/cpuinfo file. Here’s how to do it:

  1. Open a terminal window on your Linux system.
  2. Type the following command to view the contents of the cpuinfo file:
    cat /proc/cpuinfo

    This will display detailed information about your system’s CPU.

  3. Look for the flags section in the output. If your CPU supports 36-bit physical addressing, you should see the pae flag in the list of flags.

    For example, the flags section may look something like this:

    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl xsaveopt xsavec xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts pku ospke

    In this example, the pae flag is present, which means that the CPU supports 36-bit physical addressing.

If the pae flag is not present in the flags section, then your CPU does not support 36-bit physical addressing.

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