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Reducing journaling harm on virtualized I/O systems

Title
Reducing journaling harm on virtualized I/O systems
Authors
Lee E.Bahn H.Jeong M.Kim S.Yeon J.Yoo S.Noh S.H.Shin K.G.
Ewha Authors
반효경
SCOPUS Author ID
반효경scopus
Issue Date
2016
Journal Title
SYSTOR 2016 - Proceedings of the 9th ACM International Systems and Storage Conference
Keywords
CachingFile systemJournalingVirtualization
Publisher
Association for Computing Machinery, Inc
Indexed
SCOPUS scopus
Abstract
This paper analyzes the host cache effectiveness in full virtualization, particularly associated with journaling of guests. We observe that the journal access of guests degrades cache performance largely due to the write-once access pattern and the frequent sync operations. To remedy this problem, we design and implement a novel caching policy, called PDC (Pollution Defensive Caching), that detects the journal accesses and prevents them from entering the host cache. The proposed PDC is implemented in QEMU-KVM 2.1 on Linux 4.14 and provides 3-32% performance improvement for various file and I/O benchmarks. Copyright © 2016 ACM.
DOI
10.1145/2928275.2928289
ISBN
9781450343817
Appears in Collections:
엘텍공과대학 > 컴퓨터공학과 > Journal papers
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