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 <nickgeova...@gmail.com>님이 작성: > > > On Fri, Dec 31, 2021, 4:27 PM _ djdisodo <djdis...@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 >> >>
