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首页> 外文期刊>IEEE transactions on dependable and secure computing >RAW-Tag: Replicating in Altered Cache Ways for Correcting Multiple-Bit Errors in Tag Array
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RAW-Tag: Replicating in Altered Cache Ways for Correcting Multiple-Bit Errors in Tag Array

机译：RAW标签：以更改的缓存方式进行复制以更正标签阵列中的多位错误

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摘要

Tag array in on-chip caches is one of the most vulnerable components to radiation-induced soft errors. Protecting the tag array in some processors is limited to error detection using the parity check, since the overheads of error correcting codes are not affordable in this component. State-of-the-art tag protection schemes combine the parity check with replication to provide error correction capability. Classifying these replication-based schemes into partial-replication and full-replication, the former offers a low overhead protection in which a large fraction of detectable errors remain uncorrectable, whereas the latter imposes a significant overhead to correct all of the errors. This paper proposes a low overhead full-replication scheme, so called Replicating in Altered Ways of Tag (RAW-Tag), to correct all detectable errors. RAW-Tag manipulates the cache replacement algorithm and keeps track of the incoming/evicting cache lines to not only provide a replica for all tags, but also eliminate the simultaneous susceptibility of both a tag and its replica to a single Multiple-Bit Upset (MBU). The simulation results show that RAW-Tag imposes no performance overhead and increases the energy consumption of L1 and L2 caches by only 6.6 and 0.3 percent, respectively, as compared with the baseline.
机译：片上缓存中的标签阵列是最容易受到辐射引起的软错误的组件之一。在某些处理器中，保护标签阵列仅限于使用奇偶校验进行错误检测，因为错误校正代码的开销在此组件中无法承受。最新的标签保护方案将奇偶校验与复制结合在一起，以提供纠错功能。将这些基于复制的方案分为部分复制和完全复制，前者提供了一种低开销的保护，其中大部分可检测到的错误仍然无法纠正，而后者则需要大量开销来纠正所有错误。本文提出了一种低开销的全复制方案，即所谓的“以可变标记方式复制（RAW-Tag）”，以纠正所有可检测到的错误。 RAW标签可操纵高速缓存替换算法并跟踪传入/逐出的高速缓存行，不仅可为所有标签提供副本，而且还可消除标签及其副本对单个多位翻转（MBU）的同时敏感性。 ）。仿真结果表明，与基线相比，RAW-Tag不增加性能开销，并且仅将L1和L2缓存的能耗提高了6.6％和0.3％。

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