I have dual-core i7 7500U with disabled hyperthreading. In dom0, I often have total CPU usage in tens of percents (often about 50 %, i.e., about fully utilized single core). When I look at htop in dom0, it is clearly caused by qubesd, which clearly uses the vast majority of CPU during these peaks. Note that these peaks look rather random, I see no relation to any activity. But they are quite frequent.
When looking at the process tree, it has many child processes, probably one for each domU qube. But they utilize near zero CPU.
The column TIME+ confirms my CPU% observation in long term.
I am not sure where to find any relevant log. Maybe journalctl, but I have seen nothing suspicious there.
Do you have any idea about the cause, solution or even a suggestion for debugging?
Vít Šesták ‘v6ak’