No. It establishes remaining budget, not the actual overhead. Account for packet/physical occupancy and required gaps before approving the mode.

Common trap: Giving a generic fix without identifying the boundary and unmet obligation in this example.

Correlate packet/frame counts, PHY errors, receiver overflow and downstream service over the same interval. Check lane mapping/rate, sensor format, word counts, virtual channel and receiver settings. Then test frame scheduling and available buffer/service headroom. A format mismatch, channel fault or service deficit can produce different symptoms depending on receiver behaviour; do not identify the cause from drops alone.

Common trap: Only checking SI without verifying timing budget.