From owner-freebsd-current@FreeBSD.ORG  Sat Jul 10 13:17:58 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 7717316A4CF; Sat, 10 Jul 2004 13:17:58 +0000 (GMT)
Received: from mx1.imp.ch (mx1.imp.ch [157.161.9.16])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 7EAE343D2D; Sat, 10 Jul 2004 13:17:57 +0000 (GMT)
	(envelope-from mb@imp.ch)
Received: from mx1.imp.ch (mx.imp.ch [157.161.9.64])
	by mx1.imp.ch (8.12.11/8.12.11) with ESMTP id i6ADHrNk034271;
	Sat, 10 Jul 2004 15:17:53 +0200 (CEST)
	(envelope-from mb@imp.ch)
Received: from mx1.imp.ch (localhost [127.0.0.1])
	by mx1.imp.ch (8.12.11/8.12.11/Submit) with ESMTP id i6ADHpjF034238;
	Sat, 10 Jul 2004 15:17:51 +0200 (CEST)
	(envelope-from mb@imp.ch)
Received: (from clamav@localhost)
	by mx1.imp.ch (8.12.11/8.12.11/Submit) id i6ADHoqf034232;
	Sat, 10 Jul 2004 15:17:50 +0200 (CEST)
	(envelope-from mb@imp.ch)
Received: from cvs.imp.ch (cvs.imp.ch [157.161.4.9])
	by ns1.imp.ch (MIMEDefang) with ESMTP id i6ADHjST087377;
	Sat, 10 Jul 2004 15:17:50 +0200 (CEST)
Date: Sat, 10 Jul 2004 15:17:45 +0200 (CEST)
From: Martin Blapp <mb@imp.ch>
To: Robert Watson <rwatson@freebsd.org>
In-Reply-To: <20040710105224.L56824@cvs.imp.ch>
Message-ID: <20040710151637.Y56824@cvs.imp.ch>
References: <Pine.NEB.3.96L.1040709231313.19581G-100000@fledge.watson.org>
 <20040710105224.L56824@cvs.imp.ch>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
X-Spam-Checksum: bcadc137368fa75ea72d9c7ab038384e
X-Virus-Status: No
X-Spam-Level: 
X-Spam-Status: No, hits=-4.897 required=4 tests=BAYES_00,
	FORGED_RCVD_HELO
X-Scanned-By: MIMEDefang 2.42
cc: Taku YAMAMOTO <taku@tackymt.homeip.net>
cc: freebsd-current@freebsd.org
cc: Steve Kargl <sgk@troutmask.apl.washington.edu>
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: Sat, 10 Jul 2004 13:17:58 -0000


Hi,

> I'm seeing the same effect here on a 2 CPU IBM server running without HTT. The
> server is completly locked. We have running mimedefang on it and clamd, after
> 2-3 hours running, suddenly the processlist grows and grows and the box is not
> accessibe anymore.
>
> > By disabling the "#define PREEMPTION" entry in param.h with SCHED_4BSD,
> > I'm able to complete the benchmark several times in a row without apparent
> > problems. However, I'll leave it running for a few more hours and see if I
> > didn't just "get lucky".  I'll then try SCHED_ULE w/o PREEMPTION.

Tried that. PREEMPTION seems to to be the culprit. It must be something else.
I just got another lock with "#define PREEMPTION" removed !

Martin