標題: eTag: Tag-Comparison in Memory to Achieve Direct Data Access based on eDRAM to Improve Energy Efficiency of DRAM Cache
作者: Yang, Keng-Hao
Tsai, Hsiang-Jen
Li, Chia-Yin
Jendra, Paul
Chang, Meng-Fan
Chen, Tien-Fu
資訊工程學系
Department of Computer Science
關鍵字: Cache memory;DRAM chips;memory architecture;memory management;system-on-chip
公開日期: 1-Apr-2017
摘要: As 2.5D/3D die stacking technology emerges, stacked dynamic random access memory (DRAM) has been proposed as a cache due to its large capacity in order to bridge the latency gap between off-chip memory and SRAM caches. The main problems in utilizing a DRAM cache are the high tag storage overhead and the high lookup latency. To address these, we propose tags-in-eDRAM (embedded DRAM) due to its higher density and lower latency. This paper presents an eTag DRAM cache architecture that is composed of a novel tag-comparison-inmemory scheme to achieve direct data access. It eliminates access latency and comparison power by pushing tag-comparison into the sense amplifier. Furthermore, we propose a Merged Tag to enhance the eTag DRAM cache by comparing last-level cache tags and DRAM cache tags in parallel. Simulation results show that the eTag DRAM cache improves energy efficiency by 15.4% and 33.9% in 4-core and 8-core workloads, respectively. Additionally, the Merged Tag achieves 32.1% and 48.7% energy efficiency improvements in 4-core and 8-core workloads, respectively.
URI: http://dx.doi.org/10.1109/TCSI.2016.2620520
http://hdl.handle.net/11536/145347
ISSN: 1549-8328
DOI: 10.1109/TCSI.2016.2620520
期刊: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume: 64
起始頁: 858
結束頁: 868
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