From owner-freebsd-stable@FreeBSD.ORG Mon Dec 12 19:23:07 2011 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 8D6761065680 for ; Mon, 12 Dec 2011 19:23:07 +0000 (UTC) (envelope-from wollman@hergotha.csail.mit.edu) Received: from hergotha.csail.mit.edu (wollman-1-pt.tunnel.tserv4.nyc4.ipv6.he.net [IPv6:2001:470:1f06:ccb::2]) by mx1.freebsd.org (Postfix) with ESMTP id 40EAC8FC17 for ; Mon, 12 Dec 2011 19:23:07 +0000 (UTC) Received: from hergotha.csail.mit.edu (localhost [127.0.0.1]) by hergotha.csail.mit.edu (8.14.4/8.14.4) with ESMTP id pBCJN2x8043916; Mon, 12 Dec 2011 14:23:02 -0500 (EST) (envelope-from wollman@hergotha.csail.mit.edu) Received: (from wollman@localhost) by hergotha.csail.mit.edu (8.14.4/8.14.4/Submit) id pBCJN2Jk043913; Mon, 12 Dec 2011 14:23:02 -0500 (EST) (envelope-from wollman) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <20198.21654.915449.536365@hergotha.csail.mit.edu> Date: Mon, 12 Dec 2011 14:23:02 -0500 From: Garrett Wollman To: bruce@cran.org.uk In-Reply-To: <4EE6295B.3020308@cran.org.uk> References: <4EE1EAFE.3070408@m5p.com> <4EE22421.9060707@gmail.com> <4EE6060D.5060201@mail.zedat.fu-berlin.de> <20111212155159.GB73597@troutmask.apl.washington.edu> X-Newsgroups: mit.lcs.mail.freebsd-stable X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (hergotha.csail.mit.edu [127.0.0.1]); Mon, 12 Dec 2011 14:23:03 -0500 (EST) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.7 (hergotha.csail.mit.edu [127.0.0.1]); Mon, 12 Dec 2011 14:16:36 -0500 (EST) X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED autolearn=disabled version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on hergotha.csail.mit.edu Cc: stable@freebsd.org Subject: Re: SCHED_ULE should not be the default X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Dec 2011 19:23:07 -0000 In article <4EE6295B.3020308@cran.org.uk>, brucecran.org.uk writes: >This isn't something that can be fixed by tuning ULE? For example for >desktop applications kern.sched.preempt_thresh should be set to 224 from >its default. Where do you get that idea? I've never seen any evidence for this proposition (although the claim is repeated often enough). What are the specific circumstances that make this useful? Where did the number come from? -GAWollman