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Cross-core communication is increasingly a bottleneck as the number ofprocessing elements increase per system-on-chip. Typical hardware solutions tocross-core communication are often inflexible; while software solutions areflexible, they have performance scaling limitations. A key problem, as we willshow, is that of shared state in software-based message queue mechanisms. Thispaper proposes Virtual-Link (VL), a novel light-weight communication mechanismwith hardware support to facilitate M:N lock-free data movement. VL reduces theamount of coherent shared state, which is a bottleneck for many approaches, tozero. VL provides further latency benefit by keeping data on the fast path(i.e., within the on-chip interconnect). VL enables directed cache-injection(stashing) between PEs on the coherence bus, reducing the latency forcore-to-core communication. VL is particularly effective for fine-grain taskson streaming data. Evaluation on a full system simulator with 7 benchmarksshows that VL achieves a 2.09x speedup over state-of-the-art software-basedcommunication mechanisms, while reducing memory traffic by 61%.

Virtual-Link: A Scalable Multi-Producer, Multi-Consumer Message Queue Architecture for Cross-Core Communication