From owner-freebsd-stable@FreeBSD.ORG Thu Dec 15 00:11:51 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2A77D1065693 for ; Thu, 15 Dec 2011 00:11:51 +0000 (UTC) (envelope-from george@m5p.com) Received: from mailhost.m5p.com (ip-3-2-0-2.r20.asbnva02.us.ce.gin.ntt.net [IPv6:2001:418:0:5000::16]) by mx1.freebsd.org (Postfix) with ESMTP id D5BC28FC0A for ; Thu, 15 Dec 2011 00:11:50 +0000 (UTC) Received: from wonderland.m5p.com (wonderland.m5p.com [IPv6:2001:418:3fd::19]) by mailhost.m5p.com (8.14.4/8.14.4) with ESMTP id pBF0BiHO017623; Wed, 14 Dec 2011 19:11:49 -0500 (EST) (envelope-from george@m5p.com) Message-ID: <4EE93B40.3090101@m5p.com> Date: Wed, 14 Dec 2011 19:11:44 -0500 From: George Mitchell User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:8.0) Gecko/20111127 Thunderbird/8.0 MIME-Version: 1.0 To: Tom Evans References: <4EE1EAFE.3070408@m5p.com> <4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.2.7 (mailhost.m5p.com [IPv6:2001:418:3fd::f7]); Wed, 14 Dec 2011 19:11:49 -0500 (EST) X-Scanned-By: MIMEDefang 2.72 on IPv6:2001:418:3fd::f7 Cc: freebsd-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: Thu, 15 Dec 2011 00:11:51 -0000 On 12/14/11 12:54, Tom Evans wrote: > [...] This thread has shown that ULE performs poorly > in very specific scenarios where the server is loaded with NCPU+1 CPU > bound processes, [...] Minor correction: Problem occurs when there are nCPU compute-bound processes, not nCPU + 1. -- George Mitchell