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Life & fun · December 16, 2025

Deterministic PCIe Diagnostics for GPUs on Linux

I built a small Linux tool to deterministically verify GPU PCIe link health and bandwidth. It reports: - Negotiated PCIe generation and width - Peak Host→Device and Device→Host memcpy bandwidth - Sustained PCIe TX/RX utilization via NVML - A rule-based verdict derived from observable hardware data only This exists because PCIe issues (Gen downgrades, reduced lane width, risers, bifurcation) are often invisible at the application layer and can’t be fixed by kernel tuning or async overlap. Linux-only: it relies on sysfs and PCIe AER exposure that Windows does not provide.

Deterministic PCIe Diagnostics for GPUs on Linux launched on December 16, 2025 with 20 votes, #581 of 11,628 launches that month and more than 90% of that year's launches.

Visit github.com ↗Alternativestop 5% of December 2025

In plain words

Deterministic PCIe Diagnostics for GPUs on Linux is a command-line tool that verifies GPU PCIe link health and bandwidth on Linux systems. It measures negotiated PCIe generation and width, peak memory copy bandwidth in both directions, and sustained TX/RX utilization, then produces a verdict based on observable hardware data. The tool targets developers and system administrators debugging GPU connectivity issues like lane width reduction or generation downgrade that remain invisible to applications. It works only on Linux due to reliance on sysfs and PCIe AER exposure.

written from the facts on this page · September 2026

From the sources

Deterministic GPU PCIe link and bandwidth diagnostic using observable hardware data (NVML + CUDA memcpy). - parallelArchitect/gpu-pcie-diagnostic

⚠️ Note This project has been superseded by: https://github.com/parallelArchitect/gpu-pcie-path-validator This repository remains available for reference and diagnostic use cases. A deterministic command-line tool for validating GPU PCIe link health, bandwidth, and real-world PCIe utilization using only observable hardware data. Is my GPU’s PCIe link behaving as it should, and can I prove it? No registry hacks. No BIOS assumptions. No “magic” optimizations. Only measurable link state, copy throughput, and hardware counters. This tool performs hardware-observable PCIe diagnostics and reports factual results with deterministic verdicts. The tool does not attempt to tune, fix, or modify system…from github.com

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