Re: READAHEAD

From: Andrew Morton (akpm_at_osdl.org)
Date: 10/31/03

  • Next message: Karol Czachorowski: "[BUG] via82cxxx in 2.6.0-textX" 
    Date:	Fri, 31 Oct 2003 01:28:46 -0800
To: age <ahuisman@cistron.nl>

    age <ahuisman@cistron.nl> wrote:
    >
    > > Lots of people have been reporting this. It's rather weird.
    > >
    > > Is the same effect observable when reading a large file, or is it only
    > > observable via `hdparm -t'?
    > >
    >
    > Hi Andrew,
    >
    > Here are some tests with bonnie++.

    Like so many of these things, bonnie++ is generally far, far too complex
    for kernel performance tuning.

    Please, just use time, cat, dd, etc.

            mount /dev/xxx /mnt/yyy
            dd if=/dev/zero of=/mnt/yyy/x bs=1M count=1024
            umount /dev/xxx
            mount /dev/xxx /mnt/yyy
            time cat /mnt/yyy/x > /dev/null

    nice'n'easy.

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