Show HN: Deterministic PCIe Diagnostics for GPUs on Linux
github.comI 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.
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.
Is this entirely NVIDIA-specific, or can it do any diagnostics for other GPUs?
It's very much nvidia specific, not just using CUDA but the backing nvidia-specific management libraries.
Though I don't think there's anything particularly device-specific they're measuring, they're using the private nvidia interfaces to do so.
OP you should call that out a little more clearly that this is Nvidia only.