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Date: Sun, 15 Apr 2012 22:11:16 +0200
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From: "Ronald Klop" <ronald-freebsd8@klop.yi.org>
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Subject: Re: 157k interrupts per second causing 60% CPU load on idle system
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On Sun, 15 Apr 2012 15:09:34 +0200, Matt Thyer <matt.thyer@gmail.com>  
wrote:

> On Apr 15, 2012 6:27 PM, "Ronald Klop" <ronald-freebsd8@klop.yi.org>  
> wrote:
>>
>>> The problem does not occur with 9-STABLE.
>>>
>>> Who knows what the problem was ? USB maybe ?
>>
>>
>> Do you still have the same hardware on the same interrupts on 9-STABLE?
>> Are there changes in the use of MSI(-X)?
>>
> I made no hardware or BIOS changes and I'm running a GENERIC kernel in  
> all
> testing.

That does not mean FreeBSD 9 can't put devices on other interrupts than 8  
did.
'dmesg | grep irq' like you did before might show a difference with your  
previous output.
I'm just guessing here for a clue on the result you are seeing, but  
without any data I cannot answer you (and I guess nobody can).

Ronald.