# Linux 7.4 corrects AMD Zen 5 TLB size reporting in /proc/cpuinfo

> **Key takeaway:** A fix for under-reported TLB sizes on AMD Zen 5 and newer processors has been merged into the Linux 7.4 kernel.

**Published:** 2026-10-23T09:47:39+00:00 
**Source:** Phoronix Benchmarks & Drivers 
**Category:** kernel-os 
**Canonical URL:** https://fosswire.org/news/linux-74-corrects-amd-zen-5-tlb-size-reporting-in-proccpuinf.html 

## Summary
Linux 7.4 corrects how the kernel reports Translation Lookaside Buffer sizes for AMD Zen 5 Ryzen and EPYC processors, which had been under-reported because the kernel did not account for a change to 32-entry multiples. The fix ensures /proc/cpuinfo and similar interfaces show accurate values. The release also adds SEV improvements including RMPOPT optimization for confidential VMs and a new sysfs interface for SEV status reporting.

## What changed in CPU reporting
- AMD shifted TLB size reporting to multiples of 32 entries starting with Zen 5, but Linux continued using the old format
- This caused the kernel to under-report actual TLB sizes on Zen 5 Ryzen and EPYC chips
- Fix merged via the x86/cpu pull request for Linux 7.4
- Also included: RMPOPT optimization for SEV-protected confidential VMs on lightly-loaded EPYC Zen 6 servers
- New sysfs interface added for reporting AMD SEV status, merged via x86/sev pull

## Why it matters
Accurate TLB reporting matters for performance tuning and benchmarking tools that rely on /proc/cpuinfo to make scheduling or optimization decisions. The SEV additions continue AMD's push for confidential computing adoption in data centers.