Re: FreeBSD 5.3 I/O Performance / Linux 2.6.10 | Continued Discussion

From: Robert Watson (rwatson_at_FreeBSD.org)
Date: 01/28/05

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    Date: Fri, 28 Jan 2005 09:52:38 +0000 (GMT)
To: Mike Tancsa <mike@sentex.net>

    On Thu, 27 Jan 2005, Mike Tancsa wrote:

    > >I/O (reads, writes at fairly large multiples of the sector size -- 512k is
    > >a good number) and small I/O size (512 bytes is good). This will help
    > >identify the source along two dimmensions: are we looking at a basic
    > >storage I/O problem that's present even without the file system, or can we
    > >conclude that some of the additional extra cost is in the file system code
    > >or the hand off to it. Also, with the large and small I/O size, we can
    > >perhaps draw some conclusions about to what extent the source is a
    > >per-transaction overhead.
    >
    > Apart from postmark and iozone (directly to disk and over nfs), are
    > there any particular tests you would like to see done ?

    Just to get started, using dd to read and write at various block sizes is
    probably a decent start. Take a few samples, make sure there's a decent
    sample size, etc, and don't count the first couple of runs.

    Robert N M Watson

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