Re: sustained sequential disk IO runs interactivity into the ground

From: Mike Tancsa (mike_at_sentex.net)
Date: 06/21/05

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To: eng@donut.ugcs.caltech.edu, freebsd-performance@freebsd.org

    At 10:57 PM 20/06/2005, eng@donut.ugcs.caltech.edu wrote:
    >I was doing a dd of dev/zero into a file on a UFS2 filesystem
    >(softupdates disabled) on a clean 5.4-R system.

    I see the same issue on RELENG_5 with IDE disk. However, on
    FreeBSD nfs.sentex.ca 6.0-CURRENT FreeBSD 6.0-CURRENT #1: Fri Jun 17

    No such issue against an IDE drive as well as an ARECA RAID5 array. The
    box is quite responsive while blasting the disks

    Also just tested against a RELENG_5 box and a twe RAID1 array and no
    problems. The system is totally responsive while doing So it might be the
    IDE drivers on RELENG_5 ? Perhaps try sos@freebsd.org's backport of the
    CURRENT IDE drivers to stable.

             ---Mike

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