Date: Mon, 03 Jul 2006 08:34:34 -0400 From: Chuck Swiger <cswiger@mac.com> To: Nikos Vassiliadis <nvass@teledomenet.gr> Cc: nocturnal <nocturnal@swehack.se>, freebsd-questions@freebsd.org Subject: Re: Interrupt using all the CPU Message-ID: <44A90EDA.6040707@mac.com> In-Reply-To: <200607031504.39332.nvass@teledomenet.gr> References: <44A8D770.5060808@swehack.se> <44A8F0D6.4060307@swehack.se> <200607031306.12477.Danovitsch@vitsch.net> <200607031504.39332.nvass@teledomenet.gr>
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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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