Date: Fri, 17 Oct 2003 14:24:29 +0200 (CEST) From: "Hartmann, O." <ohartman@mail.physik.uni-mainz.de> To: freebsd-questions@freebsd.org Subject: Performance impact with SCHED_ULE in 5.1? Message-ID: <20031017141842.T84681@mail.physik.uni-mainz.de>
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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
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