Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 1 Nov 2001 14:11:03 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 1 Nov 2001 14:10:53 -0500 Received: from air-1.osdl.org ([65.201.151.5]:31237 "EHLO osdlab.pdx.osdl.net") by vger.kernel.org with ESMTP id ; Thu, 1 Nov 2001 14:10:37 -0500 Subject: Re: OSDL Scalable Test Platform test for linux_2_4_13 From: "Timothy D. Witham" To: Dmitry Volkoff Cc: linux-kernel@vger.kernel.org In-Reply-To: <20011101065107.A23409@localhost> In-Reply-To: <20011101065107.A23409@localhost> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Evolution/0.16 (Preview Release) Date: 01 Nov 2001 11:11:22 -0800 Message-Id: <1004641889.3339.28.camel@wookie-laptop.pdx.osdl.net> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org A couple of items explain these differences. The 1st is that UnixBench is a single stream number and is almost 100% cached even with a smaller (128KB) cache. Also the benchmark uses a very small amount of memory. This means that for any given version of the compiler and OS the best absolute performance number will be produced by the machine with the fastest single CPU. And you won't see any improvement from adding additional CPUS. So what you are seeing is the difference between a single CPU running at 866MHz on the 2 way and a single CPU running at 700 MHz on the 4 way. And of course your 1.4GHz would give better numbers as you are looking at 700Mhz, 866MHz and then 1.4 GHz and so the numbers should be The idea behind this test setup isn't to compare machine x verses machine y. (That's what marketing departments do.) But to be able to compare the same hardware against its self before and after a kernel change. wookie On Wed, 2001-10-31 at 19:51, Dmitry Volkoff wrote: > > These tests were performed against 2, 4, and 8 CPU > > IA-32 (Intel) servers. > > UnixBench results are somewhat funny. > 4-CPU machine is slower than the one with 2 CPU (238.4 vs 260.0)? > Well, on UP Athlon 1.4Ghz with only 512 Mb RAM I get 460... > > -- > > DV > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- Timothy D. Witham - Lab Director - wookie@osdlab.org Open Source Development Lab Inc - A non-profit corporation 15275 SW Koll Parkway - Suite H - Beaverton OR, 97006 (503)-626-2455 x11 (office) (503)-702-2871 (cell) (503)-626-2436 (fax) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/