This counter tracks packets discarded from a specific receive priority for reasons other than simply running out of buffer space -- such as corrupted frames or other processing errors. Administrators monitor this separately from the buffer-discard counter to distinguish genuine traffic-volume congestion from actual packet-quality or hardware problems affecting a given priority queue. For example, a rising error count on one particular receive priority, distinct from any buffer-discard growth, would point an admin toward investigating a link-quality or hardware issue rather than simple oversubscription.