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2002 FREENIX Track Technical Program - Abstract

Recent Filesystem Optimisations in FreeBSD

Ian Dowse, Corvil Networks; David Malone, CNRI, Dublin Institute of Technology

Abstract

In this paper we summarise four recent optimisations to the FFS implementation in FreeBSD: soft updates, dirpref, vmiodir and dirhash. We then give a detailed exposition of dirhash's implementation. Finally we study these optimisations under a variety of benchmarks and look at their interactions. Under micro-benchmarks, combinations of these optimisations can offer improvements of over two orders of magnitude. Even real-world workloads see improvements by a factor of 2-10.
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Last changed: 16 May 2002 ml
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