Does Linux 3.10 CFS have "timeslices"?
I am confused, because sched-design-CFS.txt clearly states:
CFS uses nanosecond granularity accounting and does not rely on any jiffies or other HZ detail. Thus the CFS scheduler has no notion of "timeslices" in the way the previous scheduler had, and has no heuristics whatsoever. There is only one central tunable (you have to switch on CONFIG_SCHED_DEBUG):
which can be used to tune the scheduler from "desktop" (i.e., low latencies) to "server" (i.e., good batching) workloads.
But then multiple task scheduler tuning guides suggest two different formulas of calculating a "timeslice". (Depending on the number of runnable tasks.) For example this OpenSUSE guide.
I am running only SCHED_FIFO threads on isolated CPUs.