Dynamic interval polling and pipelined post I/O processing for low-latency storage class memory

Authors:
Dong In Shin;Young Jin Yu;Hyeong S. Kim;Jae Woo Choi;Do Yung Jung;Heon Y. Yeom
Affiliations:
Taejin Infotech, Korea;Seoul National University, Korea;Seoul National University, Korea;Taejin Infotech, Korea;Taejin Infotech, Korea;Seoul National University, Korea
Venue:
HotStorage'13 Proceedings of the 5th USENIX conference on Hot Topics in Storage and File Systems
Year:
2013

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Abstract

Emerging non-volatile memory technologies as a disk drive replacement raise some issues of software stack and interfaces, which have not been considered in disk-based storage systems. In this work, we present new cooperative schemes including software and hardware to address performance issues with deploying storage-class memory technologies as a storage device. First, we propose a new polling scheme called dynamic interval polling to avoid the unnecessary polls and reduce the burden on storage system bus. Second, we propose a pipelined execution between storage device and host OS called pipelined post I/O processing. By extending vendor-specific I/O interfaces between software and hardware, we can improve the responsiveness of I/O requests with no sacrifice of throughput.