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Date: Sat, 10 Jan 2015 12:52:57 +0100
From: Hans Petter Selasky <hps@selasky.org>
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To: Daniel Kolesa <quaker66@gmail.com>, Adrian Chadd <adrian@freebsd.org>, 
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Subject: Re: Lynx Point USB - large amount of interrupts (300k / second)
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On 01/10/15 00:37, Daniel Kolesa wrote:
> 2015-01-09 23:26 GMT+00:00 Daniel Kolesa <quaker66@gmail.com>:
>> 2015-01-09 20:24 GMT+00:00 Adrian Chadd <adrian@freebsd.org>:
>>> hi,
>>>
>>> I have a haswell desktop box at home:
>>>
>>> CPU: Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz (3192.67-MHz K8-class CPU)
>>>
>>> With lynx point USB:
>>
>> Also Haswell here, but with H97 chipset, which means Wildcat Point
>> USB. Not getting the issue.
>>
>>>
>>> adrian@test-2:~ % dmesg | grep ehci
>>> ehci0: <Intel Lynx Point USB 2.0 controller USB-B> mem
>>> 0xf7f1c000-0xf7f1c3ff irq 16 at device 26.0 on pci0
>>> usbus1 on ehci0
>>> ehci1: <Intel Lynx Point USB 2.0 controller USB-A> mem
>>> 0xf7f1b000-0xf7f1b3ff irq 23 at device 29.0 on pci0
>>> usbus2 on ehci1
>>>

Hi,

You can easily check who's generating the interrupts by setting:

hw.usb.ehci.debug=16
hw.usb.xhci.debug=16

If the interrupt status is all-zero, then it is a bug somewhere else!

--HPS