From owner-freebsd-current@FreeBSD.ORG Sun Nov 30 11:54:18 2003 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 D1ACD16A4CE for ; Sun, 30 Nov 2003 11:54:18 -0800 (PST) Received: from tx1.oucs.ox.ac.uk (tx1.oucs.ox.ac.uk [129.67.1.167]) by mx1.FreeBSD.org (Postfix) with ESMTP id 52A4543FBF for ; Sun, 30 Nov 2003 11:54:17 -0800 (PST) (envelope-from colin.percival@wadham.ox.ac.uk) Received: from scan1.oucs.ox.ac.uk ([129.67.1.166] helo=localhost) by tx1.oucs.ox.ac.uk with esmtp (Exim 4.20) id 1AQXe4-0005ZD-HD for freebsd-current@freebsd.org; Sun, 30 Nov 2003 19:54:16 +0000 Received: from rx1.oucs.ox.ac.uk ([129.67.1.165]) by localhost (scan1.oucs.ox.ac.uk [129.67.1.166]) (amavisd-new, port 25) with ESMTP id 21265-05 for ; Sun, 30 Nov 2003 19:54:16 +0000 (GMT) Received: from gateway.wadham.ox.ac.uk ([163.1.161.253]) by rx1.oucs.ox.ac.uk with smtp (Exim 4.20) id 1AQXe4-0005ZA-3p for freebsd-current@freebsd.org; Sun, 30 Nov 2003 19:54:16 +0000 Received: (qmail 22350 invoked by uid 0); 30 Nov 2003 19:54:16 -0000 Received: from colin.percival@wadham.ox.ac.uk by gateway by uid 71 with qmail-scanner-1.16 (sweep: 2.14/3.71. spamassassin: 2.53. Clear:. Processed in 1.534738 secs); 30 Nov 2003 19:54:16 -0000 X-Qmail-Scanner-Mail-From: colin.percival@wadham.ox.ac.uk via gateway X-Qmail-Scanner: 1.16 (Clear:. Processed in 1.534738 secs) Received: from dhcp1131.wadham.ox.ac.uk (HELO piii600.wadham.ox.ac.uk) (163.1.161.131) by gateway.wadham.ox.ac.uk with SMTP; 30 Nov 2003 19:54:14 -0000 Message-Id: <5.0.2.1.1.20031130190339.0322e0b8@popserver.sfu.ca> X-Sender: cperciva@popserver.sfu.ca X-Mailer: QUALCOMM Windows Eudora Version 5.0.2 Date: Sun, 30 Nov 2003 19:54:12 +0000 To: freebsd-current@freebsd.org From: Colin Percival Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Subject: Re: user:sys time ratio 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: Sun, 30 Nov 2003 19:54:19 -0000 Robert Watson suggested that I compare performance from UP and SMP kernels: # /usr/bin/time -hl sh -c 'make -s buildworld 2>&1' > /dev/null Real User Sys UP kernel 38m33.29s 27m10.09s 10m59.15s (retest) 38m33.18s 27m04.40s 11m05.73s SMP w/o HTT 41m01.54s 27m10.27s 13m29.82s (retest) 39m47.50s 27m08.05s 12m12.20s SMP w/HTT 42m17.16s 28m12.82s 14m04.93s (retest) 44m09.61s 28m15.31s 15m44.86s That enabling HTT degrades performance is not surprising, since I'm not passing the -j option to make; but a 5% performance delta between UP and SMP kernels is rather surprising (to me, at least), and the fact that the system time varies so much on the SMP kernel also seems peculiar. Is this normal? Colin Percival