This read-only PerfCounter64 counts frames dropped because ingress class-of-service processing was disabled on this flow point, per its "Ingress COS Disabled" description. It flags a specific configuration-driven drop reason distinct from congestion, helping an administrator recognize that traffic loss traces back to a COS setting rather than an oversubscribed queue. For example, if a newly provisioned flow point shows steady cmFlowPointHistoryFdicd counts, the technician should check whether ingress COS was left disabled during turn-up.