SCHED_ULE problem: slow single processor, realtime prio vs network stack

Andrew Reilly andrew-freebsd at
Thu Aug 28 16:44:14 UTC 2008

On Thu, 28 Aug 2008 12:37:08 +0200
Gary Jennejohn <gary.jennejohn at> wrote:

> Ah yes, but do you have options PREEMPTION set, which was Jeff's question?

I believe that I answered that question in an earlier post, but
for what it's worth, the answer is an emphatic "yes": PREEMPTION
is turned on in GENERIC (along with _KPOSIX_PRIORITY_SCHEDULING
and SMB), and my (posted) kernel config is essentially include
GENERIC, turn off I486_CPU and I586_CPU, and override SCHED_ULE
(or not).  So unless the config include mechanism is broken, I've
got PREEMPTION, (and so has nearly everyone else).



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