Re: High CPU usage / high number of interrupts

> Can you determine if irq 128 is being shared by any devices?

I couldn't determine that from dmesg.boot, but I think there could be some useful information in that file. I attached the file to this e-mail. Thank you!

Best,
0x1eef

Sent with [Proton Mail](https://proton.me/) secure email.

------- Original Message -------
On Saturday, November 26th, 2022 at 8:49 PM, Paul Procacci <pprocacci@gmail.com> wrote:

> Can you determine if irq 128 is being shared by any devices?
> Usually this information can be found in `dmesg' or '/var/run/dmesg.boot'.
> vmstat indeed shows a device but it sometimes doesn't show all the devices sharing that IRQ. It's possible you're being misled by vmstat.
> Just trying to get the complete picture here of devices. ;)
> Thanks,
> Paul Procacci
>
> On Sat, Nov 26, 2022 at 6:21 PM 0x1eef <0x1eef@protonmail.com> wrote:
>
>> Hi !
>>
>>> Out of curiosity, have you pulled a usb device one by one until the interrupts disappear?
>>
>> I have three USB devices connected: mouse, keyboard, and an ethernet adapter.
>> I tried to remove each one by one, and I did not see the interrupt rate change.
>> I have also tried a cold boot without any USB devices connected, and the interrupt rate was about the same too.
>>
>> I don't know if it could be related, but there's a trackpad connected to the laptop that does not work. Maybe it has no relation to the issue, but setting "hw.psm.synaptics_support" to "0" also did not help.
>>
>> When Chromium loses focus, CPU usage usually drops to 0% and does not go above 10% - for as long as I am not using Chromium. I am using the i915 / drm kernel modules.. I saw another report of high CPU usage related to using those two kernel modules, but I wasn't able to identify that as the problem in my case.
>>
>> Thanks for the help.
>>
>> Sent with [Proton Mail](https://proton.me/) secure email.
>>
>> ------- Original Message -------
>> On Saturday, November 26th, 2022 at 8:06 PM, Paul Procacci <pprocacci@gmail.com> wrote:
>>
>>> Hey,
>>>
>>> Not sure of the problem, but I don't see the correlation between Chrome and any usb driver.
>>> Out of curiosity, have you pulled a usb device one by one until the interrupts disappear?
>>> I'd be curious to know which device is slamming the system.
>>>
>>> Thanks,
>>> Paul
>>>
>>> On Sat, Nov 26, 2022 at 6:02 PM 0x1eef <0x1eef@protonmail.com> wrote:
>>>
>>>> Hi, everyone!
>>>>
>>>> When I use Chromium, I see a high rate of CPU usage across all four cores. The rate can be anywhere from 20% to 50%, even above that. I am not doing anything intensive, just browsing twitter, reddit, YouTube or GitHub. It has been like this since I installed FreeBSD, but since it's not a blocker I have been lazy about looking into it.
>>>>
>>>> I don't know why it happens. I can see that there are a high number of interrupts on 'xhci0', and that seems to carry over to each CPU core as well:
>>>>
>>>> # vmstat -i
>>>> interrupt total rate
>>>> irq1: atkbd0 50 0
>>>> irq9: acpi0 403 0
>>>> cpu0:timer 30716618 98
>>>> cpu1:timer 25457926 81
>>>> cpu2:timer 34344531 109
>>>> cpu3:timer 25542867 81
>>>> irq128: xhci0 328107434 1044
>>>> irq130: nvme0:admin 15 0
>>>> irq131: nvme0:io0 701041 2
>>>> irq132: nvme0:io1 692045 2
>>>> irq133: nvme0:io2 792760 3
>>>> irq134: nvme0:io3 693091 2
>>>> irq135: hdac0 1718425 5
>>>> irq136: vgapci0 6273295 20
>>>> Total 455040501 1448
>>>>
>>>> # dmesg | grep xhci0
>>>> xhci0: <Intel Ice Lake-LP USB 3.1 controller> mem 0x95110000-0x9511ffff at device 20.0 on pci0
>>>> xhci0: 32 bytes context size, 64-bit DMAusbus0 on xhci0
>>>>
>>>> It might also be helpful to know that I tried OpenBSD on the same computer but it was unusable for a similar reason: 95%+ interrupts on CPU. The impact that had made all tasks extremely slow. On FreeBSD it is not as bad, but I still think think it is not normal.
>>>>
>>>> Can anyone suggest what might be wrong, tips to debug, etc ? If more information is needed, please let me know. Thanks for your time.
>>>>
>>>> Best,0x1eef
>>>
>>> --
>>>
>>> __________________
>>>
>>> :(){ :|:& };:
>
> --
>
> __________________
>
> :(){ :|:& };: