Path: utzoo!attcan!uunet!ingr!crossgl
From: crossgl@ingr.UUCP (Gordon Cross)
Newsgroups: comp.unix.wizards
Subject: Re: System V file systems
Summary: System V file system is slower than BSD's due to organization
Keywords: System V
Message-ID: <2787@ingr.UUCP>
Date: 31 Oct 88 21:07:25 GMT
References: <6413@daver.UUCP>
Organization: Intergraph Corp. Huntsville, Al
Lines: 26

In article <6413@daver.UUCP>, dlr@daver.UUCP (Dave Rand) writes:
> Why is the System V.[23] file system _SO_ much slower than the
> BSD file system? On several systems I have, the disk performance
> seems dreadful. On one system, it is around 20K bytes per second.
> The best I have seen from System V is 200K per second - but the
> actual disk controller is capable of 1.5 megabytes per second!

The problem is with the file system organization itself so you will not be able
to "fix" it.  Any further explanation here would be far too lengthy but I can
direct you too an informative article on the subject:


          A Fast File System for UNIX

          Marshall Kirk McKusick, William N. Joy,
          Samuel J. Leffler, and Robert S. Fabry

          Computer Systems Research Group
          Computer Science Division
          Department of Electrical Engineering and Computer Science
          University of California, Berkeley
          Berkeley, CA 94720


Gordon Cross
Intergraph Corp.  Huntsville, AL