Nikos Vassiliadis wrote:
On Monday 03 July 2006 14:06, Daan Vreeken [PA4DAN] wrote:
[ ... ]
interrupt total rate
irq0: clk 25130235 99
irq1: atkbd0 4 0
irq6: fdc0 1 0
irq7: ppc0 1 0
irq8: rtc 288300 1
irq11: atapci1 637852 2
irq12: vr0 uhci0+ 3890833 15
irq13: npx0 1 0
irq14: ata0 54 0
Total 29947281 119
Hmm.. There seems to be nothing wrong with these numbers. If you were
suffering from an interrupt storm I would have expected much larger numbers
in the "rate" column. The column "rate" shows the average number of
interrupts / second. In total your system handles about 120 interrupts /
second, so that shouldn't be a problem.
I have the feeling that rate is calculated like this:
number of interrupts since boottime / seconds of uptime
OK.
so, this won't help if his is having now an interrupt storm
while most of the time the system is interrupted ~ 120 times
per second
An interrupt storm on what, though?
The ~100 interrupts per second from the clock on IRQ0 are absolutely normal
with HZ=100; the only other candidate seems to be the combination of vr0 & USB
controller on IRQ 12.
If it's possible to disable the USB controller for a bit in the BIOS, it would
be interesting to see whether that makes any difference. You can probably
kill the parallel port, too.
It's also interesting to note that IRQ 8, the RTC, seems to be mostly idle--
normally that fires at stathz=128...check "sysctl kern.clockrate".
systat -vmstat $time shows interrupts per second regarding the last $time
seconds
Right, although the output from "vmstat 1" would survive being pasted into
email better, I suspect.
--
-Chuck
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