The present invention relates to the field of enterprise network computing. In particular, it relates to a method and respective system for monitoring workload of a workload scheduler. Information defining a plurality of test jobs of low priority is received. The test jobs have respective launch times, and the test jobs are launched for execution in a data processing system in accordance with said launch times and said low execution priority. It is evaluated how many of said test jobs are executed within a pre-defined analysis time range. A performance decrease warning is issued, if the number of executed test jobs is lower than a predetermined threshold number. The workload scheduler discards launching of jobs having a low priority when estimating that a volume of jobs submitted with higher priority is sufficient to keep said scheduling system busy.