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
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Re: options PREEMPTION: system failure issue?

[Jay]

On Fri, Jan 21, 2005 at 10:59:26PM +0100, O. Hartmann wrote:
 Have they performance penalties, stability issues in FreeBSD 5.3 
 (especially SMP
 environment but also in UP environment)?

I would bet a month's salary that they have performance penalties.
There's a lot of overhead associated with most of the for debugging
options in the kernel.

If you don't know why you need one of those options, you probably don't
need them.  (Now, if you're running -CURRENT, it's a different story,
but if you're running -CURRENT, you should know if you need them).


-- 
Jay.
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