In a communication interconnect such as PCIe which favors post transmissions such as write requests over non-post transmissions such as read requests and completions, methods and systems for shortening the delay for non-post transmissions while maintaining fairness among the post transmissions. Undispatched non-post transmission requests are monitored on a running basis; and when a running value of the undispatched non-post transmission requests exceeds a threshold; ones of the post transmission requests are randomly dropped.