Ramide Dantas,  Carlos Kamienski,  Dênio Mariz,  Djamel Sadok. 

Despite the recent trend for deploying QoS-based services, the Internet still offers only the best effort service. Therefore, non-elevated services have been proposed, offering low delay to some applications that can support a higher packet loss rate. There are currently some approaches for providing non-elevated services, yet they generally rely on complex mechanisms. In this paper we propose a simple mechanism based on a FIFO queue that allows setting different priorities for incoming and outgoing packets, called IOPQ (In/Out Priority Queue). IOPQ was evaluated through comparative simulations with DropTail and RED queues, showing some significant results.

http://www.lbd.dcc.ufmg.br:8080/colecoes/sbrc/2004/020.pdf

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