Using SCHED_ULE vs. SCHED_4BSD ...

[Martin Cracauer]

Kiffin Gish wrote on Thu, Dec 29, 2005 at 12:21:00PM +0100: 
> I recently upgraded from 5.4 to 6.0 and noticed the introduction of
> option SCHED_ULE for supporting multi-processor environments.
> 
> However, I understood that using SCHED_ULE with only one CPU can also
> improve performance significantly.
> 
> Is this true, and if so, what are the risks involved dropping good old
> SCHED_4BSD for the new-and-improved scheduler?

I have not even noticed an increase in performance from ULE when
running my benchmark suite on a two-processor system.

Some people say ULE has problems, but mostly on high CPU counts.

So it probably doesn't matter either way.

Martin
-- 
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Martin Cracauer <cracauer at cons.org>   http://www.cons.org/cracauer/
FreeBSD - where you want to go, today.      http://www.freebsd.org/