From owner-freebsd-current@FreeBSD.ORG Tue Jul 6 11:19:31 2004 Return-Path: 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 3C14916A4CE; Tue, 6 Jul 2004 11:19:31 +0000 (GMT) Received: from gate1.psi.de (gate1.psi.de [194.115.214.187]) by mx1.FreeBSD.org (Postfix) with ESMTP id 81C8043D5C; Tue, 6 Jul 2004 11:19:30 +0000 (GMT) (envelope-from thorsten@tgreiner.net) Received: from [172.18.1.50] (host-172.194.115.213.psi.de [194.115.213.172]) by gate1.psi.de (8.12.8/8.11.3) with ESMTP id i66BJT1u008394; Tue, 6 Jul 2004 13:19:29 +0200 Received: from infra-nev-exf.psi.de ([194.115.215.7]) by [172.18.1.50] with Microsoft SMTPSVC(5.0.2195.6713); Tue, 6 Jul 2004 13:19:29 +0200 Received: from comm-nev1.nev.psi.de ([194.115.215.40]) by infra-nev-exf.psi.de with Microsoft SMTPSVC(5.0.2195.6713); Tue, 6 Jul 2004 13:19:27 +0200 Received: from localhost. (dhcp239.nev.psi.de [192.168.142.239]) by comm-nev1.nev.psi.de (8.8.8+Sun/8.8.8) with ESMTP id NAA07837; Tue, 6 Jul 2004 13:19:27 +0200 (MET DST) Received: from localhost. (localhost [127.0.0.1]) by localhost. (8.12.11/8.12.11) with ESMTP id i66BJRFi001922; Tue, 6 Jul 2004 13:19:27 +0200 (CEST) (envelope-from thorsten@tgreiner.net) Received: (from thorsten@localhost) by localhost. (8.12.11/8.12.11/Submit) id i66BJR9L001921; Tue, 6 Jul 2004 13:19:27 +0200 (CEST) (envelope-from thorsten@tgreiner.net) X-Authentication-Warning: localhost.: thorsten set sender to thorsten@tgreiner.net using -f Date: Tue, 6 Jul 2004 13:19:26 +0200 From: Thorsten Greiner To: Robert Watson Message-ID: <20040706111926.GA1723@tybalt.nev.psi.de> References: <20040705184940.GA2651@tybalt.greiner.local> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="zhXaljGHf11kAtnf" Content-Disposition: inline In-Reply-To: X-GPG-Fingerprint: ED45 DF41 BE30 6FF5 DC4F 15C3 4538 6598 E865 F66A User-Agent: Mutt/1.5.6i X-OriginalArrivalTime: 06 Jul 2004 11:19:27.0891 (UTC) FILETIME=[19BFBE30:01C4634B] cc: current@freebsd.org 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Jul 2004 11:19:31 -0000 --zhXaljGHf11kAtnf Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable * Robert Watson [2004-07-06 08:21]: > The patch below appears to (brute force) eliminate the crash/hang I'm > experiencing with SCHED_ULE in the post-preemption universe. However, I > was experiencing it only in the SMP case, not UP, so it could be I'm just > not triggering it timing-wise. This would be a temporary fix until jhb is > online again post-USENIX to take a look, assuming this works around the > problem for people other than me. It does work here (as did backing out the native preemption stuff). > Note that this is probably damaging to interrupt processing latency. I have not observed anything unusual with this patch. There are seemingly no increases of build times for my projects and I did not experience any interactivity glitches (no jumpy mouse or the like). Regards -Thorsten --=20 Those who in quarrels interpose, must often wipe a bloody nose. =20 This message is digitally signed. To verify its integrity, download a copy of GnuPG for your operating system from http://www.gnupg.org . --zhXaljGHf11kAtnf Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFA6oq+RThlmOhl9moRAohSAJ9Mpu/Ihin7ssruAbFbDYYwFKLF7QCfb/jY LTaDgGp9r1zqExHXU9GLEqM= =BwC7 -----END PGP SIGNATURE----- --zhXaljGHf11kAtnf--