Cortés Martín, AlbertoGarcía Rubio, CarlosCampo Vázquez, María CelesteGarcía Lozano, Estrella MaríaRodriguez-Carrión, Alicia2012-01-262012-01-2620118th IEEE International Workshop on Middleware and system support for pervasive computing. (Seattle, USA, march 21-25, 2011), pp. 239-244978-1-61284-938-6 (print version)978-1-61284-936-2 (online version)https://hdl.handle.net/10016/13086Proceedings of the 8th IEEE International Workshop on Middleware and system support for pervasive computing, march 21-25, 2011, Seattle, USAMany modern devices come with several, heterogeneous, network interface cards (NICs). However, simple operations like transferring data flows to the cheapest NIC or to one with enough Quality of Service (QoS) are awkward tasks on most Operating Systems. In this paper, we discuss the criteria to select the proper NIC for a given data flow. We also present a new Operating System service, called netqos, to publish data and figures of merit for these criteria. The main objective of netqos is providing relevant information to applications and middleware about NIC selection criteria, isolating them from the idiosyncrasies of the many QoS gathering tools and allowing to choose the proper NIC to fit their needs. We have built this new service as a synthetic file system for the Linux kernel. We describe our experiences in using it in a real-world scenario and the practical and inherent limitations of this approachapplication/pdfeng©IEEEconference outputTelecomunicaciones10.1109/PERCOMW.2011.5766876open access