A controller for managing several managed switching elements that forward data in a network is described. The controller includes an interface for receiving input logical forwarding plane data in terms of input events data. The controller includes a converter for converting the input logical forwarding plane data to output physical control plane data by processing the input events data. The physical control plane data is for subsequent translation into physical forwarding plane data. The controller includes an input scheduler for (1) categorizing the input events data into different groups based on certain criteria and (2) supplying the input events data into the converter in a manner that each different group of input events data is processed separately by the converter.