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Show HN: Deterministic PCIe Diagnostics for GPUs on Linux

Show HN: Deterministic PCIe Diagnostics for GPUs on Linux

2 comments

·December 16, 2025

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.

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AuthAuth

This is great. Are there any features you are looking to add? Would checking for bad memory blocks be useful? I've never seen it happen on a GPU but surely it must.

wtallis

Is this entirely NVIDIA-specific, or can it do any diagnostics for other GPUs?