I'm a kernel dummy, so I ask myself what the advantage von PREMPT is, so that I should use it?
PREEMPT enables the preemptible kernel, which means you can interrupt processes executing system calls in kernel mode, except when they are accessing stuff protected by a spin lock (and is modifying a global data structure - to avoid data corruption).
It lowers the average latency when reacting to interrupts. Problem is, there seem to be some execution paths in the kernel that are pretty long. The low-latency-kernel teams tries to fix this.
I personally observe that my Linux is much more responsive when displaying videos with preempt on.
With kind regards, Oliver Korpilla
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