One of the urgent requests is how to maintain a router ' s data forwarding capability while the router ' s control software is restarted / reloaded which called " graceful restart " or " non - stop forwarding " . after the analysis on the process of graceful ospf restart described by rfc3623 and the implementation of each ip network service vendor , it is found that these resolutions of graceful ospf restart has some defaults that it can ’ t restart gracefully in some cases in the application now . for this reason , in this page , the perhaps reason of graceful restart is all found out firstly 本文在分析、比较rfc3623所述的温和重启的流程以及各ip网络服务提供商所实现的温和重启的基础上,发现其在理论上和实际应用中所存在的不足,即其实现方法仅仅局限于前启动模式,并不能解决所有原因触发的温和重启,为此提出了把温和重启分为前/后两种启动模式、并设计了前/后两种启动模式相配合的框架来实现温和重启。
A raw ( read after write ) dependency loop model is developed in this paper to analyze the raw hazards of register operands in complex pipeline . based on this model , a " dynamic " data forwarding policy is suggested to reduce the pipeline stalls caused by data raw hazards . theoretical analysis and practical experiments both show that the average cpi increment caused by data raw hazards can be reduced effectively by the dynamic data forwarding strategy 对于单发射结构的处理器,降低cpi值的根本途径在于通过各种软硬件技术减少流水线的停顿,本文构造了一个raw相关环路模型用于分析流水线中寄存器操作数的raw竞争现象,并提出了一种“动态”数据旁路优化策略,可以最大程度地减少复杂流水线中因数据的raw竞争而导致的互锁停顿,理论分析和实测结果充分表明“动态”数据旁路机构可以有效地降低流水线因raw互锁导致的平均cpi增量。