IRQ storm on xhci0

[Eitan Adler]

On 2 May 2018 at 00:22, Hans Petter Selasky <hps at selasky.org> wrote:
> On 05/02/18 06:22, Eitan Adler wrote:
>>
>> On 1 May 2018 at 20:53, Eitan Adler <lists at 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.

Heh. should have added that to the list of things I did. There is no traffic.



-- 
Eitan Adler