Abstract: This application relates to systems and methods for controlling the flow of transport layer packets (TLP) in a peripheral component interconnect express (PCIe)-based environment. In an exemplary embodiment, an arbiter in a PCIe device determines the amount of data, if any, that should be expected in response to transmission of a particular TLP. If a receive buffer of the PCIe device has enough available space for storing the expected data, the arbiter permits transmission of the particular TLP. If the receive buffer does not have enough available space for storing the expected data, the arbiter suppresses transmission of the particular TLP until the receive buffer has enough available space. The exemplary embodiment may improve data flow through the PCIe environment by reducing fragmented transfers of data.