EL 10: x86-64-v3 baseline

EL 10’s x86_64 builds raise the minimum microarchitecture baseline to x86-64-v3, roughly Intel Haswell / AMD Excavator from 2013. Physical machines older than that — and VMs using outdated CPU models — cannot install or boot EL 10. AlmaLinux 10 additionally offers a v2 build as the official fallback for older hardware.

What changed

The x86-64 microarchitecture levels are how a distribution states its minimum instruction-set requirement:

Level	Representative instructions	Rough hardware era
v1	base x86-64	2003+
v2	SSE4.2, SSSE3, POPCNT	~2008 (Nehalem)
v3	AVX2, BMI1/BMI2, F16C, MOVBE	~2013 (Haswell)
v4	AVX-512	~2015 (Skylake-SP)

EL 8’s baseline was v1, EL 9 moved to v2, and EL 10 moves to v3. Raising the baseline lets compilers use the newer instructions across the entire distribution (vectorization, faster string and crypto primitives); the price is dropping older CPUs.

Baselines by release

Release	x86_64 baseline	Notes
EL 8	v1
EL 9	v2	see EL 9: x86-64-v2 baseline
EL 10	v3	RHEL 10 ships v3 only; AlmaLinux 10 also provides a v2 build

What it means for you

• Physical machines: server CPUs from 2013 on almost always qualify; confirm with the commands below.
• Virtual machines: the most common trap. Hypervisor defaults such as qemu64 or Nehalem do not satisfy v3; installing EL 10 in such a VM ends in installer crashes or illegal instruction at boot. Set the CPU model to Haswell or newer, or use host-passthrough.
• AlmaLinux users: the project publishes x86-64-v2 images and repositories for older CPUs; RHEL 10 and Rocky Linux 10 offer no v2 fallback.

Caution

A baseline mismatch shows up as illegal-instruction crashes, often late in an install or only when a specific program runs, which makes it expensive to diagnose. Check CPU flags before committing to EL 10.

How to check

Look for the key v3 instructions

grep -o -m1 -E 'avx2|bmi2|f16c|movbe' /proc/cpuinfo | sort -u
lscpu | grep -i 'flags' | tr ' ' '\n' | grep -cE '^(avx2|bmi1|bmi2|f16c|movbe)$'

Having all five key flags (avx2, bmi1, bmi2, f16c, movbe) means v3 is satisfied. In VMs also check the CPU model the hypervisor exposes:

Inspect a libvirt VM's CPU model

sudo virsh dumpxml <vm> | grep -A2 '<cpu'

Further reading

• EL 9: x86-64-v2 baseline — the previous baseline raise
• EL 10 changes overview — the rest of EL 10’s notable changes
• Distro overview — positioning and choosing among EL distributions