E420R with very high kernel activity (how to debug)

From: David Foster (foster_at_ncmir.ucsd.edu)
Date: 01/29/04

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    Date: Thu, 29 Jan 2004 11:17:45 -0800 (PST)
To: sunmanagers@sunmanagers.org

    I have an E420R (rack-mounted Ultra80) system running Solaris 8
    at kernel 108528-27, recommended patches installed. This system
    is one of our main NFS servers, with an A5100 and a T3+ attached
    via fibre.

    'top' shows a high amount of "kernel thrashing":

    CPU states: 71.6% idle, 0.2% user, 25.5% kernel, 2.7% iowait, 0.0% swap

    and NFS clients are getting error messages like:

    Jan 29 10:59:41 superman kernel: nfs: server <host> not responding, still trying
    Jan 29 10:59:42 superman kernel: nfs: server <host> OK

    NFS activity is noticably slow.

    Suggestions as to how to debug this would be very welcome. We have a second
    NFS server that has similar iowait stats but does not show similar kernel
    activity, same OS/kernel/patches. Kernel patch 108528-26 had similar
    problems, moving to -27 didn't help.

    Dave Foster

      =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
       David Foster National Center for Microscopy and Imaging Research
        Programmer/Analyst University of California, San Diego
        dfoster[at]ucsd[dot]edu Department of Neuroscience, Mail 0608
        (858) 534-7968 http://ncmir.ucsd.edu/
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