High INTERRUPT rate on CPU 0

[illoai at gmail.com]

2009/11/17 neutral neutral <ptr.neutral at gmail.com>:
> Hello,
>
> Yesterday I get a fresh install of FreeBSD 8.0 RC3 Current. However just
> some hours after the installation the machine began very slow/laggy.
. . .
> $ vmstat -i
> interrupt                          total       rate
> irq1: atkbd0                         201          0
> irq12: psm0                            9          0
> irq16: fwohci0+                        2          0
> irq19: uhci2 ehci*              25229879      89151
> irq23: uhci3 ehci1                  4852         17
> cpu0: timer                       565386       1997
> irq256: mskc0                        389          1
> cpu1: timer                       562755       1988
> Total                           26363473      93157
> $
>
>
> $ dmesg | grep uhci2
> uhci2: <Intel 82801I (ICH9) U$ dmesg | grep uhci2
> uhci2: <Intel 82801I (ICH9) USB controller> port 0x1840-0x185f irq 19 at
> device 26.2 on pci0
> uhci2: [ITHREAD]
> uhci2: LegSup = 0x0010
> usbus2: <Intel 82801I (ICH9) USB controller> on uhci2
> SB controller> port 0x1840-0x185f irq 19 at device 26.2 on pci0
> uhci2: [ITHREAD]
> uhci2: LegSup = 0x0010
> usbus2: <Intel 82801I (ICH9) USB controller> on uhci2

Umm, IRQ19 looks a bit suspect.  My noisiest non-CPU IRQ
is running 31, so you're only 3 orders of magnitude higher.

What usb devices do you have attached to those controllers?

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