options PREEMPTION: system failure issue?

[O. Hartmann]

Hello.
I have a very simple question about the kernel options

options PREEMPTION
options MUTEX_WAKE_ALL

Have they performance penalties, stability issues in FreeBSD 5.3 
(especially SMP
environment but also in UP environment)?

PREEMPTION ist listet in "NOTES" as a debuggin option but discussed 
prior here as
a performance boost.

Thanks,
Oliver