From owner-freebsd-hackers@FreeBSD.ORG Wed Sep 20 05:08:40 2006 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6418616A417 for ; Wed, 20 Sep 2006 05:08:40 +0000 (UTC) (envelope-from mv@thebeastie.org) Received: from p4.roq.com (ns1.ecoms.com [207.44.130.137]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0359B43D46 for ; Wed, 20 Sep 2006 05:08:37 +0000 (GMT) (envelope-from mv@thebeastie.org) Received: from p4.roq.com (localhost.roq.com [127.0.0.1]) by p4.roq.com (Postfix) with ESMTP id D7D0B4CD94 for ; Wed, 20 Sep 2006 05:10:07 +0000 (GMT) Received: from vaulte.jumbuck.com (ppp166-27.static.internode.on.net [150.101.166.27]) by p4.roq.com (Postfix) with ESMTP id 699594CD9D for ; Wed, 20 Sep 2006 05:10:07 +0000 (GMT) Received: from vaulte.jumbuck.com (localhost [127.0.0.1]) by vaulte.jumbuck.com (Postfix) with ESMTP id AD5E38A065; Wed, 20 Sep 2006 15:08:35 +1000 (EST) Received: from [192.168.46.102] (unknown [192.168.46.250]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by vaulte.jumbuck.com (Postfix) with ESMTP id A96368A029; Wed, 20 Sep 2006 15:08:35 +1000 (EST) Message-ID: <4510CCD3.5060000@thebeastie.org> Date: Wed, 20 Sep 2006 15:08:35 +1000 From: Michael Vince User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.7.13) Gecko/20060727 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Danny Braniss References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: ClamAV using ClamSMTP X-Virus-Scanned: ClamAV using ClamSMTP Cc: freebsd-hackers@freebsd.org Subject: Re: numbers don't lie ... X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Sep 2006 05:08:40 -0000 Danny Braniss wrote: >Im testing these 2 boxes, Sun X4100 and Dell-2950, and: > > SUN X4100: Dual Core AMD Opteron(tm) Processor 280 (2393.19-MHz K8-class CPU) > one 70g sata disk > DELL 2950: Intel(R) Xeon(TM) CPU 3.20GHz (3192.98-MHz K8-class CPU) > 4 sata disks + raid0 > >they both run identical 6.1-STABLE. > >my 'cpu benchmark' shows the amd being much better than the intel. >but, doing a make buildworld give interesting results: > >dell-2950 : make -j16 TARGET_ARCH=amd64 buildworld : 24m17.41s real 1h3m3.26s >user 17m15.07s sys >dell-2950 : make -j8 TARGET_ARCH=amd64 buildworld : 24m8.28s real 1h2m59.38s >user 16m16.20s sys > >sunfire : make -j16 TARGET_ARCH=amd64 buildworld : 24m21.38s real 49m6.68s >user 14m22.64s sys >sunfire : make -j8 TARGET_ARCH=amd64 buildworld : 23m47.69s real 48m53.58s >user 13m44.81s sys > >which probably says something about my 'cpu benchmark' :-( >but why is the user time so much different between the boxes? > > > Even though your asking about user time I would like to point out I have long prefered to see build world as by far a hard disk io benchmark over a CPU benchmark. After doing such benchmarks my self I have noticed my raid 1 SAS Dells with upto 40% less CPU power crush my Dell dual socket 3.6ghz raid 5 SAS servers in buildworld speed, this is purely because simple fact raid 5 is much slower on writes, CPU has far less to do with buildworld performance. Also a Dell 2950 on SATA seems to be a bit of a odd combination as I would believe most people get the SAS drives for a Dell 2950 and use the PERC5 / mfi SAS device crontroller. Mike