A non-work-conserving scheduler to provide proportional delay Differentiated Services

The proportional delay differentiation (PDD) model provides a consistent packet delay differentiation between classes of service. So far, present schedulers performing the PDD model still cannot achieve desired delay proportion observed under light load, or in all timescales under moderate load. Thus, we propose a nonwork-conserving (NWC) scheduler, which utilizes the pseudo-waiting time for an empty queue and forces each class to compare its priority with those of all other classes. Simulation results reveal that NWC outperforms all current schedulers in achieving the PDD model.