Bug ?: SCHED_4BSD VS SCHED_ULE

Kris Kennaway kris at obsecurity.org
Fri Nov 4 08:38:52 GMT 2005


On Thu, Nov 03, 2005 at 10:58:58PM -0500, Ian Lord wrote:
> Hi,
> 
> I am running amd64 version on a Dell 2850 Dual Xeon processor with emt64
> 
> as soon as I turn on SCHED_ULE instead of SCHED_4BSD in rc.conf, the 
> system starts to behave strangely.
> 
> During boot, named and sshd can't start normally, system is unstable, etc
> 
> Is that a known bug or isnt it suppose to work anyway on this kind of 
> system ?

You forgot to mention what version of FreeBSD you're running.  Also,
you don't control the scheduler from rc.conf, it's compiled into your
kernel.

Anyway, SCHED_ULE is better on 6.0 than on previous releases, but it's
still not officially supported, and there are some known problems with
it.

Kris
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