Improving Memory Bank-Level Parallelism in the Presence of Prefetching

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Provided by: Association for Computing Machinery
Topic: Hardware
Format: PDF
DRAM systems achieve high performance when all DRAM banks are busy servicing useful memory requests. The degree to which DRAM banks are busy is called DRAM Bank-Level Parallelism (BLP). This paper proposes two new cost-effective mechanisms to maximize DRAM BLP. BLP-Aware Prefetch Issue (BAPI) issues prefetches into the on-chip Miss Status Holding Registers (MSHRs) associated with each core in a multi-core system such that the requests can be serviced in parallel in different DRAM banks. BLP-Preserving Multi-core Request Issue (BPMRI) does the actual loading of the DRAM controller's request buffers so that requests from the same core can be serviced in parallel, minimizing the serialization of each core's concurrent requests.
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