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having high cpu problem related to kernel version

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  having high cpu problem related to kernel version _ djdisodo <djdisodo@gmail.com> - 2021-12-31 23:30 +0100
    Re: having high cpu problem related to kernel version Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-01-02 19:30 +0100
      Re: having high cpu problem related to kernel version _ djdisodo <djdisodo@gmail.com> - 2022-01-03 20:10 +0100

#243563 — having high cpu problem related to kernel version

note that i'm using debian sid and xfce4

it shows full of red bars on htop on one of the core between two(i
have atom n455 cpu)
iirc red bars means kernel threads

i've tested using debian's boot menu so only thing changed is kernel version
it was fine on kernel 5.10 it's happening on kernel 5.14 and 5.15

i don't know exactly how to represent, but it isn't hard to if i just
do something like browsing or reading pdf it just starts to happen and
never stops even after i close all apps or log out

https://asciinema.org/a/xTXqyZhg06enfrcHbuhasGJrm
https://asciinema.org/a/y0klCFDWSOsjjAQTUHlHM84mq

1st link is when it's fine(right after boot)

2nd link is when it happens

there is no difference on application running between two

xserver is unrelated it's high cpu usage is just because of more
updates on htop screen

if i watch htop on ctrl+alt+f1 terminal xserver isn't even on the
first page but htop still shows high cpu usage

https://asciinema.org/a/l81ZO3hSHbA4jLm6fwLlIrfUS
recorded on ctrl+alt+f1 terminal
ran htop as root and enabled to show kernel threads
tho cpu usage of kernel threads aren't being displayed

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#243586

[Multipart message — attachments visible in raw view] — view raw

On Fri, Dec 31, 2021, 4:27 PM _ djdisodo <djdisodo@gmail.com> wrote:

> note that i'm using debian sid and xfce4
>
> it shows full of red bars on htop on one of the core between two(i
> have atom n455 cpu)
> iirc red bars means kernel threads
>
> i've tested using debian's boot menu so only thing changed is kernel
> version
> it was fine on kernel 5.10 it's happening on kernel 5.14 and 5.15
>
> i don't know exactly how to represent, but it isn't hard to if i just
> do something like browsing or reading pdf it just starts to happen and
> never stops even after i close all apps or log out
>
> https://asciinema.org/a/xTXqyZhg06enfrcHbuhasGJrm
> https://asciinema.org/a/y0klCFDWSOsjjAQTUHlHM84mq
>
> 1st link is when it's fine(right after boot)
>
> 2nd link is when it happens
>
> there is no difference on application running between two
>
> xserver is unrelated it's high cpu usage is just because of more
> updates on htop screen
>

And I think to get a better reading of the system state, you have to reduce
the frequency of htop updates. Say down to every 3 or 4 secs to start.

I don't see what you see in the video recordings you stored. Maybe because
the top of the screen image you recorded seems to get corrupted towards the
end of the video. But htop itself is taking 15% of a CPU by then.


> if i watch htop on ctrl+alt+f1 terminal xserver isn't even on the
> first page but htop still shows high cpu usage
>
> https://asciinema.org/a/l81ZO3hSHbA4jLm6fwLlIrfUS
> recorded on ctrl+alt+f1 terminal
> ran htop as root and enabled to show kernel threads
> tho cpu usage of kernel threads aren't being displayed
>
>

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#243635

[Multipart message — attachments visible in raw view] — view raw

I found that this is a bug of kernel module "rtl8723ae"
and it also happens on kernel 5.10
i wasn't able to pin it out because i updated packages right after i
installed it
i was able to find related thread on askubuntu
https://askubuntu.com/questions/846830/irq-from-realtek-wifi-are-loading-cpu
typed `modprobe -r rtl8723ae` and cpu gone back to normal

i wasn't able to find any solution to this

this one, i  guess
https://github.com/torvalds/linux/tree/master/drivers/net/wireless/realtek/rtlwifi/rtl8723ae

2022년 1월 3일 (월) 오전 3:29, Nicholas Geovanis <nickgeovanis@gmail.com>님이 작성:

>
>
> On Fri, Dec 31, 2021, 4:27 PM _ djdisodo <djdisodo@gmail.com> wrote:
>
>> note that i'm using debian sid and xfce4
>>
>> it shows full of red bars on htop on one of the core between two(i
>> have atom n455 cpu)
>> iirc red bars means kernel threads
>>
>> i've tested using debian's boot menu so only thing changed is kernel
>> version
>> it was fine on kernel 5.10 it's happening on kernel 5.14 and 5.15
>>
>> i don't know exactly how to represent, but it isn't hard to if i just
>> do something like browsing or reading pdf it just starts to happen and
>> never stops even after i close all apps or log out
>>
>> https://asciinema.org/a/xTXqyZhg06enfrcHbuhasGJrm
>> https://asciinema.org/a/y0klCFDWSOsjjAQTUHlHM84mq
>>
>> 1st link is when it's fine(right after boot)
>>
>> 2nd link is when it happens
>>
>> there is no difference on application running between two
>>
>> xserver is unrelated it's high cpu usage is just because of more
>> updates on htop screen
>>
>
> And I think to get a better reading of the system state, you have to
> reduce the frequency of htop updates. Say down to every 3 or 4 secs to
> start.
>
> I don't see what you see in the video recordings you stored. Maybe because
> the top of the screen image you recorded seems to get corrupted towards the
> end of the video. But htop itself is taking 15% of a CPU by then.
>
>
>> if i watch htop on ctrl+alt+f1 terminal xserver isn't even on the
>> first page but htop still shows high cpu usage
>>
>> https://asciinema.org/a/l81ZO3hSHbA4jLm6fwLlIrfUS
>> recorded on ctrl+alt+f1 terminal
>> ran htop as root and enabled to show kernel threads
>> tho cpu usage of kernel threads aren't being displayed
>>
>>

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