Re: High CPU usage / high number of interrupts

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 DMA
>> usbus0 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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