Re: `top` reports all CPU states as 0% on i386

From: Jason George (bsdlists_at_masterplan.org)
Date: 01/12/04

  • Next message: Sean McNeil: "MINMSS cripples samba server to winXP box" 
    To: freebsd-current@freebsd.org
Date: Mon, 12 Jan 2004 01:32:44 GMT

    >I think this problem is usually caused by one of the clock interrupts
    >stopping. Checking the output of "vmstat -i" can confirm this - check
    >for:
    >
    >clk irq0 1044322763 100
    >rtc irq8 1352668148 129
    >
    >The rate for the first one should 100 (Or possibly HZ, if you have
    >adjusted HZ). The rate of the second should be about 128, unless
    >things have got confused.
    >
    > David.

    Yikes! I think my RTC has left the building!

    > vmstat -i
    interrupt total rate
    irq1: atkbd0 1 0
    irq6: fdc0 4 0
    irq10: fxp0 xl0 86393 1
    irq11: atapci0 255394 3
    irq13: npx0 1 0
    irq0: clk 8087632 99
    Total 8429425 103
    >

    Another point of interest is that about 8 months ago, I added
    kern.timecounter.hardware=i8254 to /etc/sysctl.conf because the system clock
    was going insane - it was counting off an hour of system time in the matter
    of a minute or so of wristwatch time.

    --Jason
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