A HighQueueDropRate fault results in a PerformanceException for the affected system or VLAN. IP Performance Manager detects a HighQueueDropRate fault when the number of packets discarded due to input or output queue overflow exceeds the QueueDropThreshold. The input (or output) queue overflow is derived by dividing the number of packets designated to be sent (or received) that were discarded due to queue overflow by the total number of packets in the queue.
This threshold is contained in both the Generic Interface/Port Performance setting and the Ethernet Interface/Port Performance setting. Chapter 7, "Customizing Polled Data Thresholds," in the VMware Smart Assurance IP Management Suite Configuration Guide describes these settings.