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Subject: Re: IRQ storm on xhci0
To: Eitan Adler <lists@eitanadler.com>, usb@freebsd.org
References: <CAF6rxgk4u+2SrrOO18ceAJOWp1wMdGxAHfGVE40Y0t-=bzJFnQ@mail.gmail.com>
 <CAF6rxgmdAVEvwC0cgaXE_Oz1Z84TjMPfKJ3MYPYm5KQbKH7E=Q@mail.gmail.com>
From: Hans Petter Selasky <hps@selasky.org>
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Date: Wed, 2 May 2018 09:22:25 +0200
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On 05/02/18 06:22, Eitan Adler wrote:
> On 1 May 2018 at 20:53, Eitan Adler <lists@eitanadler.com> wrote:
>> Hi all,
>>
>> I am noticing consistently high IRQ rates on xhci0
>>
>> example from vmstat -i right now:
>> irq259: xhci0                    2222153       1876
>>
>> and this is not the highest I've seen.
>>
>> My understanding is that a rate of 1876/s is insane for USB devices.
>> Any suggestions of what I can do to debug?
>>
>> Things I've tried:
>> - disabling MSI interrupts
>> - disabling MSI-X interrupts
>> - powering off all usb devices using usbconfig
>> - unplugging all USB devices
>>
>> One thing of note:
>> My mobo has a broken USB connector resulting in one of the two front
>> USB-3 ports not working. I'm guessing this is related but I'd like
>> some confirmation and/or a way to bypass the issue in software.
> 
> with insane debugging enabled:
> 

Try to see with usbdump if any traffic is passing on xhci0.

--HPS