From owner-freebsd-current@FreeBSD.ORG  Tue Jul  6 12:14:31 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id AFE9616A4CE; Tue,  6 Jul 2004 12:14:31 +0000 (GMT)
Received: from cell.sick.ru (cell.sick.ru [217.72.144.68])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id DC25143D5C; Tue,  6 Jul 2004 12:14:30 +0000 (GMT)
	(envelope-from glebius@cell.sick.ru)
Received: from cell.sick.ru (glebius@localhost [127.0.0.1])
	by cell.sick.ru (8.12.9/8.12.8) with ESMTP id i66CESMO066904
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO);
	Tue, 6 Jul 2004 16:14:28 +0400 (MSD)
	(envelope-from glebius@cell.sick.ru)
Received: (from glebius@localhost)
	by cell.sick.ru (8.12.9/8.12.6/Submit) id i66CESOX066903;
	Tue, 6 Jul 2004 16:14:28 +0400 (MSD)
Date: Tue, 6 Jul 2004 16:14:27 +0400
From: Gleb Smirnoff <glebius@cell.sick.ru>
To: "Michael L. Hostbaek" <mich@FreeBSD.org>,
	Robert Watson <rwatson@FreeBSD.org>,
	Thorsten Greiner <thorsten@tgreiner.net>,
	Bosko Milekic <bmilekic@FreeBSD.org>, current@FreeBSD.org
Message-ID: <20040706121427.GA66881@cell.sick.ru>
References: <20040705184940.GA2651@tybalt.greiner.local>
	<Pine.NEB.3.96L.1040706001249.2853I-100000@fledge.watson.org>
	<20040706121247.GC38662@mich2.itxmarket.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=koi8-r
Content-Disposition: inline
In-Reply-To: <20040706121247.GC38662@mich2.itxmarket.com>
User-Agent: Mutt/1.5.6i
Subject: Re: Native preemption is the culprit [was Re: today's CURRENT
	lockups]
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Jul 2004 12:14:31 -0000

On Tue, Jul 06, 2004 at 02:12:47PM +0200, Michael L. Hostbaek wrote:
M> > The patch below appears to (brute force) eliminate the crash/hang I'm
M> > experiencing with SCHED_ULE in the post-preemption universe.  However, I
M> > was experiencing it only in the SMP case, not UP, so it could be I'm just
M> > not triggering it timing-wise.  This would be a temporary fix until jhb is
M> > online again post-USENIX to take a look, assuming this works around the
M> > problem for people other than me.
M> 
M> I've been using this patch on my UP machine for 5-6 hours now, without
M> any hangs/crashes.

I have just removed #define PREEMPTION in param/machine.h and rebuilt 
kernel. No problems during working day.

-- 
Totus tuus, Glebius.
GLEBIUS-RIPN GLEB-RIPE