Cisco :: Why To Apply Qos And When Not

You got lots of bandwidth, expected throughput is low, and anticipated queuing/congestion is insignificant?My understanding is that QoS will kick in when there is congestion or queuing on an interface. Since an interface could either be 100% utilized or 0% utilized, is it fair to say that at any given point there could be congestion or delay on an interface?I know that the higher the interface speed, the lower the serialization delay will be, which means the lower the delay will be to put bits on the wire. For a 10Gig link, where the serialization delay is incredibly short, I imagine that even with occasional congestion, the delay would be insignificant and not affect VoIP traffic. Would this be true?