From owner-freebsd-hackers@FreeBSD.ORG  Sat Jun  7 14:33:26 2014
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Date: Sat, 07 Jun 2014 10:35:00 -0400
From: Dutch Ingraham <stoa@gmx.us>
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To: freebsd-hackers@freebsd.org
Subject: Re: Fwd: Interrupt Overload
References: <538A3432.5010303@gmx.us> <53930E19.8090603@gmx.us>
 <53931963.4040604@selasky.org>
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On 06/07/2014 09:53 AM, Hans Petter Selasky wrote:
> On 06/07/14 15:05, Dutch Ingraham wrote:
>>
>> Hi everyone - I am resending this as it is not appearing in the archives
>> so I don't believe it made it to the general list-serv. (My apologies if
>> it actually did make it.)
>>
> 
> Hi,
> 
> UHCI controllers should not produce more than 1000 IRQ/s. Is the
> interrupt perhaps shared?
> 
> --HPS
> 
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> 
Thanks, Hans.  Here's some output from <vmstat -i>:

interrupt	total		rate
irq1 atkbd0	48		0
irq16 uhci0	19937714	43248
irq18 atapci0+	886		1
[snip]

There are no other UHCI's in the list.

A <dmesg | grep uhci> produces only one instance at uhci0:

"uhci0: <UHCI (generic) USB controller> port 0xff20-0xff3f \
irq16 at device 26.0 on pci0"

Is there another command you're thinking of to produce better information?