Re: having high cpu problem related to kernel version

From	_ djdisodo <djdisodo@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: having high cpu problem related to kernel version
Date	2022-01-03 20:10 +0100
Message-ID	<DBASu-3J8-7@gated-at.bofh.it> (permalink)
References	<DAyzn-6SU-3@gated-at.bofh.it> <DBdMe-6w9-7@gated-at.bofh.it>
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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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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

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