CPU Requirement for Rocky Linux v9 (And Redhat Enterprise Linux v9)

Summary: Old AMD Opteron 24xx CPUs are not supported by Enterprise Linux v9 (EL9).

From Redhat:

In the summer of 2020, AMD, Intel, Red Hat, and SUSE collaborated to define three x86-64 microarchitecture levels on top of the x86-64 baseline. The three microarchitectures group together CPU features roughly based on hardware release dates:

• x86-64-v2 brings support (among other things) for vector instructions up to Streaming SIMD Extensions 4.2 (SSE4.2)  and Supplemental Streaming SIMD Extensions 3 (SSSE3), the POPCNT instruction (useful for data analysis and bit-fiddling in some data structures), and CMPXCHG16B (a two-word compare-and-swap instruction useful for concurrent algorithms).

• x86-64-v3 adds vector instructions up to AVX2, MOVBE (for big-endian data access), and additional bit-manipulation instructions.

• x86-64-v4 includes vector instructions from some of the AVX-512 variants.

Links

• https://forums.rockylinux.org/t/el9-will-require-x86-64-v2-support/5311
• https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level#
  

Script

#!/usr/bin/awk -f
 
BEGIN { 
    while (!/flags/) if (getline < "/proc/cpuinfo" != 1) exit 1
    if (/lm/&&/cmov/&&/cx8/&&/fpu/&&/fxsr/&&/mmx/&&/syscall/&&/sse2/) level = 1
    if (level == 1 && /cx16/&&/lahf/&&/popcnt/&&/sse4_1/&&/sse4_2/&&/ssse3/) level = 2  
    if (level == 2 && /avx/&&/avx2/&&/bmi1/&&/bmi2/&&/f16c/&&/fma/&&/abm/&&/movbe/&&/xsave/) level = 3
    if (level == 3 && /avx512f/&&/avx512bw/&&/avx512cd/&&/avx512dq/&&/avx512vl/) level = 4
    if (level > 0) { print "CPU supports x86-64-v" level; exit level + 1 }
    exit 1
}