基于指令流混合比与功能单元匹配的软错误脆弱性控制方法

Soft error vulnerability controlling based on matching of instruction flow mix and functional unit configuration

发射队列是处理器流水线的关键结构。降低发射队列对软错误的敏感性已成为微处理器可靠性设计不可忽视的问题。提出一种在处理器流水线前端实施的软错误脆弱性控制方法,该方法在不改变功能单元的情况下,根据指令流混合比与功能单元配置的匹配情况,调节发射队列中的指令类型比例,降低指令在发射队列中的等待时间,从而降低发射队列的体系结构脆弱因子,缓解软错误敏感性。实验结果表明,该方法平均减低发射队列的架构易感因子2.8%左右,IPC/AVF提高约4.9%。

Issue queue is a critical structure in the pipeline. Reducing soft error vulnerability of issue queue cannot be ignored in the field of microprocessor reliability design. This paper proposed a vulnerability controlling method which did not change functional unit configuration. It adjusted the instruction mix in issue queue, reduced the waiting time of instruction in issue queue to reduce the architectural vulnerability factor and receive the goal of mitigation soft error vulnerability. The experiment result shows that average reduces of architectural vulnerability factor are 2.8% and improvement of reliability-performance is 4.9%.