Using SCHED_ULE vs. SCHED_4BSD ...

[Kris Kennaway]

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.

Kris
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20051230/05c51b6c/attachment.bin