Re: High CPU usage / high number of interrupts

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.

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------- 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
>
> --
>
> __________________
>
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