Arch Linux

kalle01

Member

Registered: 2026-05-19

Posts: 1

task scheduler problem in plasma

Hi all,

since a recent update (I am not sure which) plasma-kde seems to run all processes on cpu 0, making the system extremely slow.

I start the desktop environment from cmd (startx or startplasma-wayland).

Before starting plasma,

 taskset -p $$ 

yields

 current affinity mask: fffffffff  

, after starting plasma the shell inside plasma yields

 current affinity mask: 1 

whereas the affinity mask of systemd is still

 current affinity mask: fffffffff 

Moving to another desktop (e.g. gnome) the console produces

taskset -p $$
pid 109224's current affinity mask: fffffffff

Further, any process executed from the Konsole in plasma runs on cpu 0 only although the process is certainly a threaded application. If that application is demanding enough it freezes the entire computer.

From my above trail and error I presume that the problem is plasma/kde related and has potentially something to do with the task scheduler.

Any help appreciated.