Scalable QoS-aware memory controller for high-bandwidth packet memory

Hyuk Jun Lee, Eui Young Chung

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This paper proposes a high-performance scalable quality-of-service (QoS)-aware memory controller for the packet memory where packet data are stored in network routers. A major challenge in the packet memory controller design is to make the design scalable. As the input and output bandwidth requirement and the number of output queues for routers increase, the memory system becomes a bottleneck that limits the performance and scalability. Existing schemes require an input and output buffer that store packet data temporarily before they are written into or read from the memory. With the buffer size proportional to the number of output queues, the buffer becomes a limiting factor for scalability. Our scheme consists of a hashing logic and a reorder buffer whose size is not proportional to the number of output queues and is scalable with the increasing number of output queues. Another major challenge in the packet memory controller design is supporting QoS. As an increasing number of internet packets become latency sensitive, it is critical that the memory controller is capable of providing different QoS to packets belonging to different classes. To the best of our knowledge, no published work on the packet memory controller supports QoS. In this paper, we show our scheme reduces the SRAM buffer size of the existing schemes by an order of magnitude whereas guaranteeing a packet loss probability as low as 10-20. Our QoS-aware scheduler shows that it meets the latency requirements assigned to multiple service classes under dynamically changing input loads for multiple classes using a feedback control loop.

Original languageEnglish
Article number4453954
Pages (from-to)289-301
Number of pages13
JournalIEEE Transactions on Very Large Scale Integration (VLSI) Systems
Issue number3
Publication statusPublished - 2008 Mar

Bibliographical note

Funding Information:
Manuscript received November 17, 2006; revised April 10, 2007. This work was supported in part by the Basic Research Program of the Korea Science and Engineering Foundation under Grant R01-2006-000-10156-0 and by Korean Ministry of Information and Communications under the IT R&D Project. H.-J. Lee is with the Cisco Systems, San Jose, CA 95134 USA (e-mail: E.-Y. Chung is with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea (e-mail: Digital Object Identifier 10.1109/TVLSI.2007.915367 1OC levels describe a range of digital signals that can be carried on SONET fiber optic network. The data rate for OC-n is n 51.8 Mbits/s.

All Science Journal Classification (ASJC) codes

  • Software
  • Hardware and Architecture
  • Electrical and Electronic Engineering


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