Using SCHED_ULE vs. SCHED_4BSD ...
kris at obsecurity.org
Fri Dec 30 20:34:50 PST 2005
On Thu, Dec 29, 2005 at 12:21:00PM +0100, Kiffin Gish wrote:
> 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?
The risks are that you system will perform 10-20% slower under load,
and may sometimes panic or spontaneously reboot.
In other words: ULE is not production-ready. This may of course
change at a later date.
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