From owner-freebsd-performance@FreeBSD.ORG Fri Oct 24 16:01:17 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8AF5A16A4B3 for ; Fri, 24 Oct 2003 16:01:17 -0700 (PDT) Received: from amsfep13-int.chello.nl (amsfep13-int.chello.nl [213.46.243.24]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1E12D43FBF for ; Fri, 24 Oct 2003 16:01:16 -0700 (PDT) (envelope-from dodell@sitetronics.com) Received: from sitetronics.com ([213.46.142.207]) by amsfep13-int.chello.nl (InterMail vM.5.01.05.17 201-253-122-126-117-20021021) with ESMTP id <20031024230114.YVIA4557.amsfep13-int.chello.nl@sitetronics.com>; Sat, 25 Oct 2003 01:01:14 +0200 Message-ID: <3F99AF34.2050805@sitetronics.com> Date: Sat, 25 Oct 2003 01:01:08 +0200 From: "Devon H. O'Dell" User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.4) Gecko/20030820 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Felix von Leitner , freebsd-performance@freebsd.org References: <20031024142345.GA9997@codeblau.de> In-Reply-To: <20031024142345.GA9997@codeblau.de> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: Please help me tune FreeBSD for bulk.fefe.de/scalability/ X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Oct 2003 23:01:17 -0000 Felix von Leitner wrote: >Hi! > >Several people have asked me to re-run my benchmarks after the kernels >have been properly tuned. > Hey Felix, To be totally fair, I'd like to point out the messages from freebsd-hackers that were sent earlier today: On Fri, 24 Oct 2003, Michel TALON wrote: >> What is more interesting is to look at the actual benchmark results in >> http://bulk.fefe.de/scalability/ >> in particular the section about mmap benchmarks, the only one where >> OpenBSD shines. However as soon as touching pages is benchmarked >> OpenBSD fails very much. > > look closer. openbsd's "touch page" times are identical to what you'd expect a disk access to be. the pages aren't cached, they're read from disk. so compared to systems that don't read from disk, it looks pretty bad. a 5 line patch to fix the benchmark so that the file actually is cached on openbsd results in performance much in line with freebsd/linux. The above is a reply by Ted Unangst; perhaps you'd like to look into this. --Devon