From owner-freebsd-questions@FreeBSD.ORG Fri Oct 17 05:24:37 2003 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5D4AD16A4B3 for ; Fri, 17 Oct 2003 05:24:37 -0700 (PDT) Received: from mail.physik.uni-mainz.de (mail.Physik.Uni-Mainz.DE [134.93.180.161]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4E2A943FBD for ; Fri, 17 Oct 2003 05:24:36 -0700 (PDT) (envelope-from ohartman@mail.physik.uni-mainz.de) Received: from mail.physik.uni-mainz.de (mail.physik.uni-mainz.de [134.93.180.161])h9HCOYxS086078 for ; Fri, 17 Oct 2003 12:24:35 GMT (envelope-from ohartman@mail.physik.uni-mainz.de) Date: Fri, 17 Oct 2003 14:24:29 +0200 (CEST) From: "Hartmann, O." To: freebsd-questions@freebsd.org Message-ID: <20031017141842.T84681@mail.physik.uni-mainz.de> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Subject: Performance impact with SCHED_ULE in 5.1? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Oct 2003 12:24:37 -0000 Hello. Using SCHED_ULE instead of SCHED_4BSD seems to result in massive performance losses in NFS in conjunction with the Intel "em"-NICs. We use some Intel P4 based diskless/dataless nodes for numerical calculations over GBit LAN (all machines have Intel PRO/1000 LAN NICs) with "clusterit". On the "master" machine, which is also a P4 system with em-NIC, but SCHED_4BSD scheduler, those massive NFS problems do not occur. I will do some tests to ensure its really the SCHED_ULE option but at this stage I'm sure. I also realised that on SMP machines with Intel 1000/PRO server NICs and SCHED_ULE and ADAPTIVE_MUTEXES enabled the machine gets highly instable (also in 5.1-CURRENT!). On the production systems we use FreeBSD 5.1-RELEASE-p10. Does anybody recognized similar problems? Oliver -- MfG O. Hartmann ohartman@mail.physik.uni-mainz.de ------------------------------------------------------------------ Systemadministration des Institutes fuer Physik der Atmosphaere (IPA) ------------------------------------------------------------------ Johannes Gutenberg Universitaet Mainz Becherweg 21 55099 Mainz Tel: +496131/3924662 (Maschinenraum) Tel: +496131/3924144 (Buero) FAX: +496131/3923532