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By Zayden R., September 15, 2026
A patch is coming to the Linux kernel to fix under-reported Translation Lookaside Buffer (TLB) sizes on AMD Zen 5 CPUs. This adjustment ensures accurate /proc/cpuinfo outputs, impacting AMD EPYC and Ryzen processors.
A new patch is set to correct a minor yet significant issue in the Linux kernel concerning the reporting of Translation Lookaside Buffer (TLB) sizes on AMD's Zen 5 processors. As AMD began reporting TLB sizes as multiples of 32, the Linux kernel failed to adapt, leading to inaccuracies in how these sizes were conveyed. This oversight is finally being addressed to ensure that the TLB sizes are correctly reported in system outputs like /proc/cpuinfo.
This fix is especially important for engineers and sysadmins using AMD's EPYC and Ryzen Zen 5 CPUs, as accurate TLB size reporting is crucial for performance tuning and system diagnostics. The patch is currently in the x86/cpu branch, which suggests it is not considered as urgent and is expected to be included in the Linux 7.4 merge window rather than as a fix for the current 7.3 version.
The implications of this patch extend beyond Zen 5, as it will also apply to future AMD processors, including the upcoming Zen 6. This ensures that the Linux kernel remains in sync with AMD's TLB reporting method, maintaining accurate system information for future hardware.
For engineers running systems on AMD Zen 5, it's advisable to keep an eye on the upcoming kernel updates to ensure that their systems reflect accurate TLB sizes. While this might seem a minor detail, it contributes to a more reliable and precise understanding of system resources, which is always welcome in the engineering community.