From owner-cvs-all@FreeBSD.ORG  Wed Jul  7 16:06:19 2004
Return-Path: <owner-cvs-all@FreeBSD.ORG>
Delivered-To: cvs-all@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 9B1C716A4CE; Wed,  7 Jul 2004 16:06:19 +0000 (GMT)
Received: from fledge.watson.org (fledge.watson.org [204.156.12.50])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 4D11843D3F; Wed,  7 Jul 2004 16:06:19 +0000 (GMT)
	(envelope-from robert@fledge.watson.org)
Received: from fledge.watson.org (localhost [127.0.0.1])
	by fledge.watson.org (8.12.11/8.12.11) with ESMTP id i67G5eTF038170;
	Wed, 7 Jul 2004 12:05:40 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Received: from localhost (robert@localhost)i67G5eDM038167;
	Wed, 7 Jul 2004 12:05:40 -0400 (EDT)
	(envelope-from robert@fledge.watson.org)
Date: Wed, 7 Jul 2004 12:05:40 -0400 (EDT)
From: Robert Watson <rwatson@FreeBSD.org>
X-Sender: robert@fledge.watson.org
To: John Baldwin <jhb@FreeBSD.org>
In-Reply-To: <200407071136.31815.jhb@FreeBSD.org>
Message-ID: <Pine.NEB.3.96L.1040707120506.37929A-100000@fledge.watson.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
cc: cvs-src@FreeBSD.org
cc: src-committers@FreeBSD.org
cc: cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/kern sched_ule.c
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 07 Jul 2004 16:06:19 -0000


On Wed, 7 Jul 2004, John Baldwin wrote:

> On Tuesday 06 July 2004 01:57 am, Robert Watson wrote:
> > rwatson     2004-07-06 05:57:30 UTC
> >
> >   FreeBSD src repository
> >
> >   Modified files:
> >     sys/kern             sched_ule.c
> >   Log:
> >   Temporarily disable preemption in SCHED_ULE due to reported panics and
> >   hangs due to recent preemption changes.  This change appears to remove
> >   the panic that I was running into, but at the cost of increasing
> >   ithread scheduling latency, and as such is a temporary band-aid until
> >   jhb has a chance to resolve the ule<->preemption interaction that is
> >   the source of the problem.  If it doesn't fix the problem for others--
> >   sorry!
> 
> It it just broken on SMP?  I actually did the commit from a UP
> preemption kernel using SCHED_ULE from within X11 with KDE, etc.
> running. 

I was only able to reproduce this with an SMP-enabled kernel; however, the
reports on -current were unclear and I didn't follow up on each one. 

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert@fledge.watson.org      Principal Research Scientist, McAfee Research