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Date: Tue, 16 Sep 2008 16:12:22 +0200
From: Gary Jennejohn <gary.jennejohn@freenet.de>
To: "Scott Gasch" <scott.gasch@gmail.com>
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Cc: freebsd-amd64@freebsd.org
Subject: Re: irq19 interrupt storm?
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On Mon, 15 Sep 2008 22:57:38 -0700
"Scott Gasch" <scott.gasch@gmail.com> wrote:

> Hi,
> 
> I'm running freebsd 7.0-RELEASE-p4 on a 4-core amd64 box. Nearly 100% of
> 1 cpu is constantly being used handling irq19: uhci4 interrupts. This
> seems to happen both with and without any USB devices plugged in:
> 
> vmstat -i
> interrupt total rate
> irq1: atkbd0 5 0
> irq6: fdc0 1 0
> irq17: mskc0 dc0 1180547 18
> irq18: skc0 uhci2* 163250699 2512
> irq19: uhci4++ 3187989508 49072

I think the ++ here indicates that two or more devices are sharing this
interrupt.  Try doing "grep irq.*19 /var/run/dmesg.boot" to see which
ones.  One of these devices could be the culprit.

---
Gary Jennejohn