Re: 8k interrupts/sec with USB hub

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Hi Johan,


Thanks for your answer. That seems a lot like what I am seeing because
I had a USB tracer and it showed many NAKed transactions.


Regards,

Billy.










On Wed, Nov 15, 2017 at 2:45 PM, Johan Hovold <johan@xxxxxxxxxx> wrote:
> On Wed, Nov 15, 2017 at 12:12:16PM +0000, Billy Araujo wrote:
>> Hi all,
>>
>> I built a kernel/rootfs for altera SoCkit amd uses the default SoCkit
>> device tree and I plug when in plug in a USB stick it uses the dwc2
>> driver.
>> When doing cat /proc/interrupts I get normal amount of interrupts -
>> everything seems ok.
>>
>> However, when I connect the USB stick to a USB hub and then to the
>> same USB port I get a great amount of interrupts approx. 8000 per
>> second. Anyone know why this different behaviour?
>
>> I have seen several threads with stating this issue but haven't found
>> a clear answer.
>
> This sounds familiar, take a look at:
>
>         https://lkml.kernel.org/r/20171030170802.14489-1-dianders@xxxxxxxxxxxx
>
> Johan
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