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Future Chip Multi-Processors (CMPs) may have hundreds to thousands of threads competing to access shared resources, and will require Quality-of-Service (QoS) support to improve system utilization. This paper introduces Globally-Synchronized Frames (GSF), a framework for providing guaranteed QoS in on-chip networks in terms of minimum bandwidth and maximum delay bound. The GSF framework can be easily integrated in a conventional Virtual Channel (VC) router without significantly increasing the hardware complexity. The authors exploit a fast on-chip barrier network to efficiently implement GSF.