From owner-freebsd-current@FreeBSD.ORG  Fri Jul 16 10:16:35 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 ADB7816A4CE; Fri, 16 Jul 2004 10:16:35 +0000 (GMT)
Received: from av5-2-sn3.vrr.skanova.net (av5-2-sn3.vrr.skanova.net
	[81.228.9.114])	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 6FF8743D1F; Fri, 16 Jul 2004 10:16:35 +0000 (GMT)
	(envelope-from daniel_k_eriksson@telia.com)
Received: by av5-2-sn3.vrr.skanova.net (Postfix, from userid 502)
	id 9F8E137E62; Fri, 16 Jul 2004 12:16:34 +0200 (CEST)
Received: from smtp1-1-sn3.vrr.skanova.net (smtp1-1-sn3.vrr.skanova.net
	[81.228.9.177])	by av5-2-sn3.vrr.skanova.net (Postfix) with ESMTP
	id 9151437E51; Fri, 16 Jul 2004 12:16:34 +0200 (CEST)
Received: from gadget (h130n1fls11o822.telia.com [213.64.66.130])
	by smtp1-1-sn3.vrr.skanova.net (Postfix) with ESMTP id 7466C38005;
	Fri, 16 Jul 2004 12:16:34 +0200 (CEST)
From: "Daniel Eriksson" <daniel_k_eriksson@telia.com>
To: "'Robert Watson'" <rwatson@freebsd.org>
Date: Fri, 16 Jul 2004 12:16:28 +0200
Organization: Home
Message-ID: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAAwRTrgjlFHESrKDnpN0GVQQEAAAAA@telia.com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook, Build 10.0.6626
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441
In-Reply-To: <Pine.NEB.3.96L.1040712153808.34546D-100000@fledge.watson.org>
Importance: Normal
cc: freebsd-current@freebsd.org
Subject: RE: Native preemption is the culprit [was Re: today's
	CURRENTlockups]
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: Fri, 16 Jul 2004 10:16:35 -0000

Robert Watson wrote:

> Per my earlier post, I've experienced similar unreliability.  The work
> around I'm using is to build with "#define PREEMPTION" from param.h
> disabled.  This results in a quite usable kernel, although 
> quite probably
> more poor interrupt handling latency, etc.

The server I'm running with preemption turned off becomes irresponsive and
the load average skyrockets (10+) whenever I do something as simple as
bzip2-compressing a file. Setting a nice value of 20 does not help at all.
Are you experiencing similar results on your machine?

/Daniel Eriksson