sustained sequential disk IO runs interactivity into the ground

eng_at_donut.ugcs.caltech.edu
Date: 06/21/05

  • Next message: Steven Hartland: "Re: sustained sequential disk IO runs interactivity into the ground" 
    Date: Mon, 20 Jun 2005 19:57:27 -0700
To: freebsd-performance@freebsd.org

    I was doing a dd of dev/zero into a file on a UFS2 filesystem
    (softupdates disabled) on a clean 5.4-R system.

    an exec of top took approximately 30 seconds to complete
    and then revealed sys: 13% and idle: 87%

    quit, repeat five times, same delay, same numbers each time.

    FreeBSD 4.11 managed this with only a minor interactivity
    hit.

    What's going on here? Any ideas?

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  • Next message: Steven Hartland: "Re: sustained sequential disk IO runs interactivity into the ground"

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