As per package description, RealtimeKit is a D-Bus system service that changes the scheduling policy of user processes/threads to SCHED_RR (i.e. real-time scheduling mode) on request. It is intended to be used as a secure mechanism to allow real-time scheduling to be used by normal user processes.
Command “rpm -q –whatrequires rtkit” will list all the rpm packages installed on the system which requires rtkit.
# rpm -q --whatrequires rtkit pulseaudio-10.0-5.el7.x86_64
If there is no other package using rtkit, one can disable it with below command.
# rtkitctl -k
As far as pulseaudio is concern, there is configuration option to tell pulseaudio not to use realtime scheduling. Edit /etc/pulse/default.pa and change the following.
load-module module-udev-detect tsched=0
Reboot the system for settings to take effect.
# shutdown -r now