基于虚通道的SDRAM访存调度器研究

随着半导体工艺水平的进步,CPU与存储器的速度差距越来越大,存储器带宽已成为计算机系统的关键资源。根据目前广泛使用的SDRAM存储器多体并行存储的结构特点,提出了一种基于虚通道的访存调度器和最小等待时间-读请求优先调度策略,避免了访存请求之间的数据相关性,加快了访存请求的调度,提高了存储器带宽的利用率。

A Virtual Channel Based SDRAM Access Scheduler

With the progress of semiconductor manufacturing techniques and the development of processor architectures, the gap between the processor and the DRAM speeds is becoming larger and larger, and memory bandwidth is now the primary bottleneck of improving the computer system performance. Modern DRAM provides several independent memory banks, according to this characteristics, we present a virtual channel based memory access scheduler, and a least wait time and read-first scheduling approach. This approach significantly reduce the observed main memory access latency and improve the effective memory bandwidth utility.