If you feel little breaks in moving the mouse pointer or any other stuttering on the gui during I/O operations, here is how to tweak kernel preemption to improve user experience in smooth running of the gui.
You have to set two kernel parameters with the help os sysctl(7):
1. kern.sched.kpreempt_pri
Defaults to 128. I have tried 256, and goes well.
2. kern.sched.upreempt_pri
Defaults to 0,. I set up to 64.
Test your results, then read the documentation of the scheduler on the link attached.
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