Conservative open-page policy for mixed time-criticality memory controllers

S.L.M. Goossens, K.B. Akesson, K.G.W. Goossens

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

38 Citations (Scopus)

Abstract

Complex Systems-on-Chips (SoC) are mixed time-criticality systems that have to support firm real-time (FRT) and soft real-time (SRT) applications running in parallel. This is challenging for critical SoC components, such as memory controllers. Existing memory controllers focus on either firm real-time or soft real-time applications. FRT controllers use a close-page policy that maximizes worst-case performance and ignore opportunities to exploit locality, since it cannot be guaranteed. Conversely, SRT controllers try to reduce latency and consequently processor stalling by speculating on locality. They often use an open-page policy that sacrifices guaranteed performance, but is beneficial in the average case. This paper proposes a conservative open-page policy that improves average-case performance of a FRT controller in terms of bandwidth and latency without sacrificing real-time guarantees. As a result, the memory controller efficiently handles both FRT and SRT applications. The policy keeps pages open as long as possible without sacrificing guarantees and captures locality in this window. Experimental results show that on average 70% of the locality is captured for applications in the CHStone benchmark, reducing the execution time by 17% compared to a close-page policy. The effectiveness of the policy is also evaluated in a multi-application use-case, and we show that the overall average-case performance improves if there is at least one FRT or SRT application that exploits locality. (c) 2013 EDAA.
Original languageEnglish
Title of host publicationProceedings of Design, Automation & Test in Europe & Exhibition (DATE 2013), 18-22 March 2013, Grenoble, France
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages525-530
ISBN (Print)978-1-4673-5071-6
DOIs
Publication statusPublished - 2013

Fingerprint Dive into the research topics of 'Conservative open-page policy for mixed time-criticality memory controllers'. Together they form a unique fingerprint.

Cite this