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    SubjectRe: PROBLEM: Heavy iowait on 2.6 kernels
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    My machine is heavily used for all kinds of file serving (mainly nfs),
    but also samba.
    Next to that, it is my home-server, so it runs apache2 (tuned to server
    only few clients), imap (cyrus), postfix, bugzilla (mysql) and distcc
    (used only a few times a week).
    It replaces a FreeBSD system (PII-333) running the same except distcc.
    Under

    The disk system is just a regular IDE disk (udma5) (60GB) and one
    external drive over USB2 (160 GB). The external drive is rather slow
    (20-30 MB/sec), so I disabled it during the tests.

    The weird thing is that I see this problem too when only running bonnie.
    A friend of mine tried that too under 2.6.6, his iowait went up to
    0.15%, mine to 99%.




    On Wed, 2004-06-16 at 08:15, Clint Byrum wrote:
    > On Fri, 2004-06-11 at 01:35, Guy Van Sanden wrote:
    > > I recently discovered why my new Gentoo server slows to a crawl on a
    > > intermediate load on the 2.6 kernel series. The reason seems to be an
    > > unusual amount of iowait.
    >
    > This appears similar to the problem both myself and Phy Prahbab reported
    > about 2.6 and hitting the disks too often.
    >
    > I'm wondering, what kind of workload does your machine see, and what
    > sort of disk system is in it?
    >
    >
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    ______________________________________________________________________

    Guy Van Sanden
    http://unixmafia.port5.com

    Registered Linux user #249404 - September 1997
    ______________________________________________________________________

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