Re: 'top' showing high interrupt rate

From: Andy Farkas (andyf_at_speednet.com.au)
Date: 05/21/03

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    Date: Thu, 22 May 2003 07:46:08 +1000 (EST)
To: Paul Hamilton <paul@computerwest.com.au>

    On Wed, 21 May 2003, Paul Hamilton wrote:

    > I noticed that top shows a rather high interrupt rate, usually hovering
    > around 60%! Here is a sample:-

    Try `top -S` instead. This will show system processes as well. Also, use
    `systat -v` as previously mentioned to see interrupt counts.

    > last pid: 2879; load averages: 0.34, 0.24, 0.18
    > up 1+17:26:56 17:18:10
    > 36 processes: 2 running, 33 sleeping, 1 zombie

    Zombies not good.

    > dmesg says:
    >
    > Copyright (c) 1992-2000 The FreeBSD Project.
    > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
    > The Regents of the University of California. All rights reserved.
    > FreeBSD 4.2-RELEASE #1: Tue Feb 13 22:51:23 WST 2001
    > root@ant.compwest.net.au:/usr/src/sys/compile/ANT
    > Timecounter "i8254" frequency 1193182 Hz
    > CPU: Pentium/P55C (165.79-MHz 586-class CPU)
    > Origin = "GenuineIntel" Id = 0x544 Stepping = 4
    > Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
    > real memory = 33554432 (32768K bytes)
    > avail memory = 29478912 (28788K bytes)
    >
    > Yes, the server only has 32MB or RAM, however, it's only using 4MB of VM.
    >
    > Anyone have any idea how to troubleshoot further? How can I isolate what is
    > causing the rather high interrupt rate?

    My guess is this box is a gateway/firewall and may be getting pounded on
    the network interfaces. Are you running ipfw as well? 

    --
 :{ andyf@speednet.com.au
        Andy Farkas
    System Administrator
   Speednet Communications
 http://www.speednet.com.au/
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