基于旁路通道的片上网络差别型服务实现方法

针对面向实时应用的片上多处理系统对片上网络提出的低延迟和低抖动通信质量要求,提出一种高效的QoS实现方法.该方法对于路由器中的旁路通道采用预先申请和动态调度机制,根据任务的通信需求和优先级制定了合理的资源分配和冲突处理规则.其中低延迟服务机制利用旁路和专用虚通道使延迟敏感消息尽快转发,低抖动服务机制利用虚通道保留技术和自适应路由算法维持突发消息的传输连续性.实验结果表明：与仅基于优先级和专用虚通道的QoS方法相比,该QoS方法使延迟敏感消息的平均延迟降低了41%,突发消息的平均延迟差异降低了39%,能为片上系统应用提供高质量的差别型服务.

Bypassed channels based differentiated service implementation method for network-on-chip

An efficient quality-of-service (QoS) method for network-on-chip was proposed to meet the low latency and low jitter transmission requirements of real-time applications in MPSoC (multiprocessing system-on-chip). The method utilizes pre-applying and dynamic scheduling mechanism to appropriately make use of bypass channels in routers. It allocates resources and handles conflicts sensibly according to communication tasks’ requirements and priorities. Concretely, the mechanism for low latency transmission service uses flexible bypass and specific virtual channels to forward latency critical messages as soon as possible, while the mechanism for low jitter transmission service employes virtual channel reservation and adaptive routing algorithm to maintain successive transmission and low latency variation of jitter critical messages. Experimental results showed that the average delay of latency-critical messages was reduced by 41% and the average latency difference of burst data was reduced by 39%, compared to the conventional QoS method which only based on priority and specific virtual channel. Thus the proposed method can provide high-quality differentiated service for QoC applications.