Re: kernel usage 99%

From: Keg (rhugga_at_yahoo.com)
Date: 09/29/04

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    Date: 29 Sep 2004 14:38:55 -0700

    Scott Howard <scott@hunterlink.net.au> wrote in message news:<1096452427.76624@docbert>...
    > Dock Tsai <dock.tsai@exc.epson.com.tw> wrote:
    > > SunOS myepson 5.5.1 Generic_103640-29 sun4u sparc SUNW,Ultra-5_10
    >
    > Solaris 2.5.1 patch 103640-29 was released on September 20, 1999.
    >
    > ie, your machine hasn't been patches for over 5 years - and you're asking
    > what you can do to make it better?
    >
    > UPGRADE TO SOLARIS 9 !!!
    >
    > > 21 processes: 20 sleeping, 1 on cpu
    > > CPU states: 1.0% idle, 0.0% user, 99.0% kernel, 0.0% iowait, 0.0%
    > > swap
    > > Memory: 640M real, 585M free, 512M swap free
    > > Command not understood <<---------------
    >
    > There's obviously something wrong with top. Top reads directly from
    > certainly kernel structures, and generally needs to be recompiled
    > specifically for the OS it's running on (at least in the 2.5.1 days it
    > did). What does "uptime" or "vmstat" on your machine show?
    >
    > Scott

    Also note that you may have reached the capacity of the system. Kernel
    time is a big indicator of that, if it was iowait, you could speed up
    your storage subsystem. Even patches aren't gonna reduce that kind of
    load too much. Solaris 9 might be a big improvement also. I assume you
    have rebooted the machine as well to make sure you just didn't have
    some garbled processes. I get these from time to time, most recently
    on Sun's NetConnect 3.x daemons. Every once in a while this happens to
    a pair of my 280R's running Solaris 9. (for some reason just 2 of the
    8 I have, all identical, all running apache/weblogic/mysql)

    Some utils to look at if you think your system has reached its
    capacity: sar, iostat, vmstat, and mpstat. (mpstat more than the
    others for this instance)
    -chuck

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