SCHEDULE: NOV 15-20, 2015

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Frugal ECC: Efficient and Versatile Memory Error Protection through Fine-Grained Compression

SESSION: Cache and Memory Subsystems

EVENT TYPE: Papers

EVENT TAG(S): Architectures

TIME: 11:00AM - 11:30AM

SESSION CHAIR(S): Sunita Chandrasekaran

AUTHOR(S):Jungrae Kim, Michael Sullivan, Seong-Lyong Gong, Mattan Erez

ROOM:19AB

ABSTRACT:

Because main memory is vulnerable to errors and failures, large-scale systems and critical servers utilize error checking and correcting (ECC) mechanisms to meet their reliability requirements. We propose a novel mechanism, Frugal ECC (FECC), that combines ECC with fine-grained compression to provide versatile protection that can be both stronger and lower overhead than current schemes, without sacrificing performance. FECC compresses main memory at cache-block granularity, using any left over space to store ECC information. Compressed data and its ECC information are then frequently read with a single access even without redundant memory chips; insufficiently compressed blocks require additional storage and accesses.
As examples, we present chipkill-correct ECCs on a non-ECC DIMM with ×4 chips and the first true chipkill-correct ECC for ×8 chips using a ECC DIMM. FECC relies on a new Coverage-oriented-Compression that we developed specifically for the
modest compression needs of ECC and for floating-point data.

Chair/Author Details:

Sunita Chandrasekaran (Chair) - University of Delaware|

Jungrae Kim - The University of Texas at Austin

Michael Sullivan - The University of Texas at Austin

Seong-Lyong Gong - The University of Texas at Austin

Mattan Erez - The University of Texas at Austin

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Paper provided by the ACM Digital Library

Paper also available from IEEE Computer Society