Date: Tue, 04 Jul 2006 08:57:36 +0200 From: nocturnal <nocturnal@swehack.se> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-questions@freebsd.org, Nikos Vassiliadis <nvass@teledomenet.gr> Subject: Re: Interrupt using all the CPU Message-ID: <44AA1160.70409@swehack.se> In-Reply-To: <44A90EDA.6040707@mac.com> References: <44A8D770.5060808@swehack.se> <44A8F0D6.4060307@swehack.se> <200607031306.12477.Danovitsch@vitsch.net> <200607031504.39332.nvass@teledomenet.gr> <44A90EDA.6040707@mac.com>
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Hi
kern.clockrate: { hz = 100, tick = 10000, profhz = 1024, stathz = 128 }
I'm going to see if it's possible to disable USB from the BIOS later
today, if not, can i disable the USB devices in the kernel?
Med vänliga hälsningar
Stefan Midjich aka nocturnal
[Swehack] http://swehack.se
Chuck Swiger wrote:
> 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.
>
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