Elastic Refresh: Techniques to Mitigate Refresh Penalties in High Density Memory

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Provided by: University of Teramo
Topic: Hardware
Format: PDF
High density memory is becoming more important as many execution streams are consolidated onto single chip many-core processors. DRAM is ubiquitous as a main memory technology, but while DRAM's per-chip density and frequency continue to scale, the time required to refresh its dynamic cells has grown at an alarming rate. This paper shows how currently-employed methods to schedule refresh operations are ineffective in mitigating the significant performance degradation caused by longer refresh times. Current approaches are deficient - they do not effectively exploit the flexibility of DRAMs to postpone refresh operations. This work proposes dynamically reconfigurable predictive mechanisms that exploit the full dynamic range allowed in the JEDEC DDRx SDRAM specifications.
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