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From: John Baldwin <jhb@freebsd.org>
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Date: Tue, 23 Sep 2008 16:16:13 -0400
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Cc: Mikhail Teterin <mi+mill@aldan.algebra.com>, stable@freebsd.org,
	"Paul B. Mahol" <onemda@gmail.com>
Subject: Re: 7.0-stable: a hung process - scheduler bug?
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On Tuesday 23 September 2008 02:25:05 pm Paul B. Mahol wrote:
> > The OS is: FreeBSD 7.0-STABLE/amd64 from Sat Jul 26, 2008 and the box is
> > otherwise perfectly functional. The scheduling-related options are set
> > as such:
> >
> >     options         SCHED_4BSD              # 4BSD scheduler
> >     options         _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B
> >     real-time extensions
> >
> > Let me know, what else I can do to help fix this bug -- I'm going to
> > reboot the machine tonight... Should I switch to SCHED_ULE as a
> > work-around?
> 
> SCHED_BSD4 is suboptimal for 4 CPUs, and it is replaced with SCHED_ULE
> on 7 STABLE.

SCHED_4BSD should still work fine.

-- 
John Baldwin