ASPA: Reassigning DDR5 Parity Bandwidth
Recent memory advancements, such as DDR5, HBM3, and emerging memory-centric accelerators, primarily focus on increasing bandwidth capacity, yet often omit the significance of effective bandwidth utilization, i.e., bandwidth efficiency. Motivated by the suboptimal channel allocation in DDR5, where parity accounts for 25% bandwidth overhead, we propose ASPA, an efficiency-oriented solution that reallocates parity bandwidth to boost regular data transfer. The objective of ASPA is to enhance bandwidth efficiency without compromising reliability while maintaining low hardware overhead. In particular, we leverage existing CRC (Cyclic Redundancy Check) units in DRAM chips to opportunistically generate second-tier parity for the existing ECC (Error Correction Code) parity. For bulk-sized memory accesses, only the second-tier parity is transmitted. This reduces the parity bandwidth consumption, allowing data chips to utilize more bandwidth for data transfer. Our observation indicates that the protection capability is sufficient when the second-tier parity (with a 64-bit size) is used exclusively for error detection. Furthermore, by exploiting underutilized resources in high-performance memory systems, ASPA is implemented with negligible hardware overhead.
Mon 2 FebDisplayed time zone: Hobart change
14:10 - 15:30 | |||
14:10 20mTalk | Predicting DRAM Failures at Scale: A Two-Stage Approach for Heterogeneous Systems Main Conference Chenglin Wang Xiamen University, Shouxin Wang Xiamen University, Shuyue Zhou Xiamen University, Ronglong Wu Xiamen University, Zhirong Shen Xiamen University, Lu Tang Xiamen University, Yiming Zhang Xiamen University, Jialiang Yu Huawei, Min Zhou Huawei | ||
14:30 20mTalk | MemSOS: OS-Guided Selective Memory Mirroring Main Conference Junghoon Kim Seoul National University & Samsung Electronics, Jongheon Jeong Seoul National University, Seokwon Moon Seoul National University, Seong Hoon Seo Seoul National University, Yeonhong Park Seoul National University, Jinkyu Jeong Yonsei University, Nam Sung Kim UIUC, Jae W. Lee Seoul National University | ||
14:50 20mTalk | ASPA: Reassigning DDR5 Parity Bandwidth Main Conference Fan Li University of Central Florida, Qiufeng Li George Washington University, Yanan Guo University of Rochester, Weidong Cao George Washington University, Xin Xin University of Central Florida | ||
15:10 20mTalk | HR-DCIM: High-Reliability Floating-Point Digital CIM Architecture with Unified Low-Cost Iterative Error Correction Main Conference Zhen He Tsinghua University, Yiqi Wang Tsinghua University, Zhiheng Yue Tsinghua University, Zihan Wu Tsinghua University, Huiming Han Tsinghua University, Shaojun Wei Tsinghua University, Yang Hu Tsinghua University, Fengbin Tu The Hong Kong University of Science and Technology, Shouyi Yin Tsinghua University | ||