From owner-freebsd-hackers@FreeBSD.ORG  Thu May 31 12:48:40 2012
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Date: Thu, 31 May 2012 08:48:38 -0400
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From: Ryan Stone <rysto32@gmail.com>
To: Andriy Gapon <avg@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, Adrian Chadd <adrian@freebsd.org>,
	Alexander Motin <mav@freebsd.org>
Subject: Re: ULE/sched issues on stable/9 - why isn't preemption occuring?
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On Thu, May 31, 2012 at 8:33 AM, Andriy Gapon <avg@freebsd.org> wrote:
> In this vein it might make sense to enable KTR and KTR_SCHED in GENERIC.

KTR_SCHED comes with a performance hit.  Besides, with the DTrace
sched provider that I committed this month (and MFC'ed yesterday) you
can collect schedgraph data with a D script.