Simple configuration suggestions for BFS:

Desktop:
1000 Hz
Tickless *
Full preemption
No cpu frequency scaling

Notebook / mobile device:
300 Hz
Tickless
Full preemption
CPU frequency scaling, ondemand default

Server (all sorts):
100 Hz
No tickless
No preemption
No cpu frequency scaling

Counterstrike server:
3000 Hz
No tickless
No preemption
No cpu frequency scaling

Dedicated encoding / compiling / folding / computational machine:
100 Hz
No tickless *
No preemption
No cpu frequency scaling
echo 300 > /proc/sys/kernel/rr_interval

Best power saving:
100 Hz
Tickless
No preemption
CPU frequency scaling, ondemand default

Lowest latency:
1000 Hz
No Tickless
Full preemption
No cpu frequency scaling

Tickless note: If your machine is always 100% loaded with work, you are better
off disabling it. If it has any idle time, enable tickless.