Check out the new USENIX Web site.

Home About USENIX Events Membership Publications Students
2002 FREENIX Track Technical Program - Abstract

Recent Filesystem Optimisations in FreeBSD

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


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.
  • View the full text of this paper in HTML and PDF.
    The Proceedings are published as a collective work, © 2002 by the USENIX Association. All Rights Reserved. Rights to individual papers remain with the author or the author's employer. Permission is granted for the noncommercial reproduction of the complete work for educational or research purposes. USENIX acknowledges all trademarks within this paper.

  • If you need the latest Adobe Acrobat Reader, you can download it from Adobe's site.

  • To become a USENIX Member, please see our Membership Information.
?Need help? Use our Contacts page.

Last changed: 16 May 2002 ml
Technical Program
Conference index