From owner-freebsd-current@FreeBSD.ORG Sun May 7 19:57:22 2006 Return-Path: X-Original-To: current@freebsd.org 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 7B58A16A402; Sun, 7 May 2006 19:57:22 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42]) by mx1.FreeBSD.org (Postfix) with ESMTP id 2937243D48; Sun, 7 May 2006 19:57:22 +0000 (GMT) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [209.31.154.41]) by cyrus.watson.org (Postfix) with ESMTP id 9E1ED46C09; Sun, 7 May 2006 15:57:21 -0400 (EDT) Date: Sun, 7 May 2006 20:57:21 +0100 (BST) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Kris Kennaway In-Reply-To: <20060507191641.GA1851@xor.obsecurity.org> Message-ID: <20060507205627.B46997@fledge.watson.org> References: <20060506150622.C17611@fledge.watson.org> <200605071949.54978.hadara@bsd.ee> <20060507190844.K46997@fledge.watson.org> <200605072200.42529.hadara@bsd.ee> <20060507191641.GA1851@xor.obsecurity.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: performance@freebsd.org, current@freebsd.org, csjp@FreeBSD.org Subject: Re: Fine-grained locking for POSIX local sockets (UNIX domain sockets) X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 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, 07 May 2006 19:57:22 -0000 > On Sun, May 07, 2006 at 10:00:41PM +0300, Sven Petai wrote: > >> The results in my mail were mean values over 2 runs, >> only once did I see really huge (more than 10%) differences between several >> subsequent runs with same settings, this case was clearly mentioned in the results. > > FYI, 2 is not really enough, you should do at least 10 repetitions of each > test to reduce variance (which can be a lot, despite what you saw!) and so > that differences between them can be accurately estimated. Ministat is > really helpful for this. Typically, I do 12 runs of supersmack in each configuration, and discard the first 2 runs in which the cache and scheduler (etc) are still settling, as I'm interested in the steady state. Robert N M Watson