AnalysisDevelopersSeptember 29, 2026

Debugging PCIe link retraining on an x8/x8 splitter with two RTX 3090s

Read original source →doug.sh

Running Qwen3.8-27B across two RTX 3090s on an ASUS TUF X570-Plus with a passive bifurcation riser, vLLM stalled over ten minutes at model load. Boot log showed gen3 x8 (~63 Gb/s) on root port 00:03.1, though eight gen3 lanes should move about 6.7 GB/s each way.

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