基于行冲突预测的内存控制器QoS管理机制  

A QoS Management Mechanism of Memory Controller Based on Row Conflict Prediction

作　　者：黄侃[1] 佟冬[1] 程旭[1] 

机构地区：[1]北京大学微处理器研究开发中心,北京100871

出　　处：《电子学报》2011年第2期358-363,共6页Acta Electronica Sinica

摘　　要：传统内存控制器QoS管理机制对处理器访存延迟控制能力有限.针对该问题,本文提出PRCC机制.该机制基于对后续处理器访存的预测,分析发出设备访存对处理器访存延迟的影响,阻止发出会导致处理器访存从行命中变为行冲突的设备访存,从而减少设备访存对处理器访存延迟的影响.面向北大众志SK SoC的评测结果表明:相比于传统方法,应用PRCC机制使设备访存对程序执行时间的影响从24%减少到12%,并且通过参数调节,能够在处理器与设备间取得更优的性能折衷.Traditional QoS management mechanism of memory controller cannot effectively control the latency of processor accesses.To solve this problem,this paper proposes the PRCC mechanism.Based on the prediction of the future processor accesses,PRCC analyzes the impact of device accesses on the latency of processor accesses,and prevents issuing the accesses that will result in that processor accesses change from row hits to row conflicts,so PRCC can reduce the impact of device accesses on the latency of processor accesses.The evaluation results for PKUnity-3（SK） SoC show that after applying PRCC service,the impact of device accesses on program execution time is reduced from 24% to 8%.By parameter adjustment,PRCC achieves better performance trade-offs between processor and devices than traditional methods.

关 键 词：内存控制器 访存调度 系统级芯片 服务质量 

分 类 号：TP302[自动化与计算机技术—计算机系统结构]