Method for packet flow control using credit parameters with a plurality of limits

The present invention relates to a processor and a method for processing a data packet, the method including steps of decreasing a value of a first credit parameter when the data packet is admitted to a processor at least partly based on the value of the first credit parameter and a first limit of the first credit parameter, and increasing the value of the first credit parameter, in dependence on a data storage level in a buffer in which the data packet is stored before being admitted to the processor, the value of the first credit parameter not being increased, so as to become larger than a second limit of the first credit parameter, when the buffer is empty.