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From: Dominic Marks <dom@goodforbusiness.co.uk>
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<snip/>

> >
> > kernel: Interrupt storm detected on "irq19: uhci0 uhci2";
> > throttling interrupt source
> > kernel: Interrupt storm detected on "irq18: bge0 uhci1+";
> > throttling interrupt source
>
> I get this as well.  I don't use USB so I turned that off at the BIOS
> and removed it from my kernel, but I still get "interrupt storm" on
> my bge0 device.  No idea why.

I had a similar problem on an itx board, enabling DEVICE_POLLING
fixed it. I found on this system around 8-10% of CPU time - when
idle was used for interrupts alone without this change.

That was achieved without disabling USB, which I also need.

> Performance is not all that great on this box disk-wise, but CPU wise
> it is acceptably fast.  I run FreeBSD/amd64 on it rather than
> FreeBSD/ i386.
>
>
> Vivek Khera, Ph.D.
> +1-301-869-4449 x806

-- 
Dominic
GoodforBusiness.co.uk
I.T. Services for SMEs in the UK.