From owner-freebsd-smp@FreeBSD.ORG Thu Jun 16 13:42:53 2005 Return-Path: <owner-freebsd-smp@FreeBSD.ORG> X-Original-To: freebsd-smp@FreeBSD.org Delivered-To: freebsd-smp@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 01A1416A41C for <freebsd-smp@FreeBSD.org>; Thu, 16 Jun 2005 13:42:53 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: from mail21.sea5.speakeasy.net (mail21.sea5.speakeasy.net [69.17.117.23]) by mx1.FreeBSD.org (Postfix) with ESMTP id B4D7843D1D for <freebsd-smp@FreeBSD.org>; Thu, 16 Jun 2005 13:42:52 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: (qmail 3716 invoked from network); 16 Jun 2005 13:42:52 -0000 Received: from server.baldwin.cx ([216.27.160.63]) (envelope-sender <jhb@FreeBSD.org>) by mail21.sea5.speakeasy.net (qmail-ldap-1.03) with AES256-SHA encrypted SMTP for <Vijay.Singh@netapp.com>; 16 Jun 2005 13:42:52 -0000 Received: from zion.baldwin.cx (zion.baldwin.cx [192.168.0.7]) (authenticated bits=0) by server.baldwin.cx (8.13.1/8.13.1) with ESMTP id j5GDgcth035295; Thu, 16 Jun 2005 09:42:46 -0400 (EDT) (envelope-from jhb@FreeBSD.org) From: John Baldwin <jhb@FreeBSD.org> To: freebsd-smp@FreeBSD.org Date: Thu, 16 Jun 2005 09:19:18 -0400 User-Agent: KMail/1.8 References: <637A278D8D0DBC438EA5E75C6E1818B90454D76D@magenta.hq.netapp.com> <20050604205958.A93312@fledge.watson.org> In-Reply-To: <20050604205958.A93312@fledge.watson.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Message-Id: <200506160919.19834.jhb@FreeBSD.org> X-Spam-Status: No, score=-2.8 required=4.2 tests=ALL_TRUSTED autolearn=failed version=3.0.2 X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on server.baldwin.cx Cc: Robert Watson <rwatson@FreeBSD.org>, "Singh, Vijay" <Vijay.Singh@netapp.com> Subject: Re: Benchmarking 6.0 X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD SMP implementation group <freebsd-smp.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-smp>, <mailto:freebsd-smp-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-smp> List-Post: <mailto:freebsd-smp@freebsd.org> List-Help: <mailto:freebsd-smp-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-smp>, <mailto:freebsd-smp-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 16 Jun 2005 13:42:53 -0000 On Saturday 04 June 2005 04:02 pm, Robert Watson wrote: > On Thu, 2 Jun 2005, Singh, Vijay wrote: > > Hello, I am trying to run network benchmarking using netperf. I have a > > snapshot of "systat -vmstat 1". Is it OK to see those large number of > > interrupts (~ 1998) for the lapics? > > That's a property of the increase in HZ to 1000 from 100, and that on 6.x, > each lapic generates HZ interrupts/sec to the individual processors, > rather than the programmable timer deliverable at HZ to a particular (or > round-robin'd) CPU, then that CPU broadcasting the clock tick to the other > CPUs using IPIs. The rate you see should be approximately HZ * #cpus, so > about 2000 for a dual-processor system (which is indeed about 1998). > While lowering HZ will lower the overhead associated with processing timer > ticks, it will also reduce timer granularity, which can affect performance > in other ways (for example, TCP may behave better with finer granularity > timeouts). Actually, the lapic timer runs at hz * 2 on each CPU. The interrupts are=20 local to each CPU though. > One of the things we don't show in vmstat -systat that we probably should > is per-CPU IPI rates. I've CC'd John in the hopes of convincing him to > add that to his todo list :-). Ah yes. =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org From owner-freebsd-smp@FreeBSD.ORG Fri Jun 17 17:56:13 2005 Return-Path: <owner-freebsd-smp@FreeBSD.ORG> X-Original-To: freebsd-smp@freebsd.org Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C850416A444 for <freebsd-smp@freebsd.org>; Fri, 17 Jun 2005 17:56:13 +0000 (GMT) (envelope-from scrupulous@palmstreet.ch) Received: from p54B2EF5A.dip.t-dialin.net (p54B2EF5A.dip.t-dialin.net [84.178.239.90]) by mx1.FreeBSD.org (Postfix) with SMTP id 2C11243D55 for <freebsd-smp@freebsd.org>; Fri, 17 Jun 2005 17:56:12 +0000 (GMT) (envelope-from scrupulous@palmstreet.ch) Received: from [125.220.230.140] (port=4456 helo=[monotonic]) by p54B2EF5A.dip.t-dialin.net with esmtp id 95219100769upturn44221 for freebsd-smp@freebsd.org; Fri, 17 Jun 2005 19:56:10 +0200 Mime-Version: 1.0 (Apple Message framework v728) Content-Transfer-Encoding: 7bit Message-Id: <7852529268.5133671474@p54B2EF5A.dip.t-dialin.net> Content-Type: text/plain; charset=US-ASCII; format=flowed To: freebsd-smp@freebsd.org From: Sal <scrupulous@palmstreet.ch> Date: Fri, 17 Jun 2005 19:56:09 +0200 X-Mailer: Apple Mail (2.728) Subject: One stop store for best levitra buy. 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