From owner-freebsd-net@FreeBSD.ORG Tue Jan 8 23:15:36 2013 Return-Path: Delivered-To: freebsd-net@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 539E3C69 for ; Tue, 8 Jan 2013 23:15:36 +0000 (UTC) (envelope-from barney_cordoba@yahoo.com) Received: from nm30-vm1.bullet.mail.ne1.yahoo.com (nm30-vm1.bullet.mail.ne1.yahoo.com [98.138.90.46]) by mx1.freebsd.org (Postfix) with ESMTP id 091C7200 for ; Tue, 8 Jan 2013 23:15:35 +0000 (UTC) Received: from [98.138.226.177] by nm30.bullet.mail.ne1.yahoo.com with NNFMP; 08 Jan 2013 23:12:38 -0000 Received: from [98.138.89.254] by tm12.bullet.mail.ne1.yahoo.com with NNFMP; 08 Jan 2013 23:12:38 -0000 Received: from [127.0.0.1] by omp1046.mail.ne1.yahoo.com with NNFMP; 08 Jan 2013 23:12:38 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 588279.45359.bm@omp1046.mail.ne1.yahoo.com Received: (qmail 77939 invoked by uid 60001); 8 Jan 2013 23:12:38 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1357686758; bh=sqNm0Co/cS0h5m+qmPWHm54Mq08CLeuW2+v9B05KcMQ=; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:Message-ID:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=WSSjAtosimVk3KZvPZ8nYTasCM7rB+t2gK2SKsOHfASirDedpLImnAAL3fecV8iuMt4VxxaH6Hi8Fkef1/WoU2CsV7b8Bjx8WwOTVVZmn2Mz7/NjPAOKwUFGMthQKtmN+5chMJhaYqRC9NfgfUSvalMjcDkhEsTP6pg1h2YIzw0= DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:Message-ID:Date:From:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=QlgAW6pPC4xHsv9CiR9iPuWpWhXrg30JLoK5VKAGCRApOepALpI9DybKA7jky2luZ9M1SHRFCSmUAneUk4GF7eIoPLNOpzQY/pLQvoFWjbVlDz5JW0XIeslPNOSaqQHhDVqxHy6v/pzQ8dGvV6tB9a+WqPHqnFYcOHbRYNnb7/Y=; X-YMail-OSG: 9icEtAwVM1n3M2t9W21KjXWMHLRZN1v9kPhTrb56tlwOz5c 2YqstneSb1pb2PS3uML4KBuSpdvA.Kz0Ccuv6KYcIT7mJf_qTz_cd0VZS2zp qApG.oHztI4G8bQsoE2q6.irNiGXnFCUuXCu_igm0_lwf0tr7bHZk85SYg9B Pe2Xue9wXg8QIaGo8rrTAxUhn6Sn1rwHYIWgdm6ZcsNLeyJ5OEH2dgThZ7Tg qzTsgkIFHLnE5.pU2VzuqGdbW4A.ZIR.SPz5Lso5SoADfvlRDcf0ik7wJuAB BPCUyjzwbmZ3dK1uQNK9YkNh2qcTd6ffs902PAgCNdrVoF9lPUHhzSRCiAUG CYatWQJ4JfZmyyPO6LG7WO3MEiAggRyTvUuVBHz1r4Rlu.zzLdvDFkLz8abS YsVgIYfyRnAH_TxS0EHd5MnJglQRl7rLbUoZ.MDMaGYoXgKY1lcHSnNFD0hv tu2cikg.o6u7H_HB2vuJV5LXjZfRdUxVhO_0nJ0WbvpoT563XHz6.1DljBJS tUPgDgBQTPGHF_Nw.pt_8Ql5rJtdyog-- Received: from [174.48.128.27] by web121604.mail.ne1.yahoo.com via HTTP; Tue, 08 Jan 2013 15:12:38 PST X-Rocket-MIMEInfo: 001.001, DQoNCi0tLSBPbiBUdWUsIDEvOC8xMywgSWFuIFNtaXRoIDxzbWl0aGlAbmltbmV0LmFzbi5hdT4gd3JvdGU6DQoNCj4gRnJvbTogSWFuIFNtaXRoIDxzbWl0aGlAbmltbmV0LmFzbi5hdT4NCj4gU3ViamVjdDogUmU6IFRvIFNNUCBvciBub3QgdG8gU01QDQo.IFRvOiAiR2FycmV0dCBDb29wZXIiIDx5YW5lZ29taUBnbWFpbC5jb20.DQo.IENjOiAiQmFybmV5IENvcmRvYmEiIDxiYXJuZXlfY29yZG9iYUB5YWhvby5jb20.LCAiRXJpY2ggRG9sbGFuc2t5IiA8ZXJpY2hzZnJlZWJzZGxpc3RAYWxvZ3QuY29tPiwBMAEBAQE- X-Mailer: YahooMailClassic/15.1.2 YahooMailWebService/0.8.130.494 Message-ID: <1357686758.66466.YahooMailClassic@web121604.mail.ne1.yahoo.com> Date: Tue, 8 Jan 2013 15:12:38 -0800 (PST) From: Barney Cordoba Subject: Re: To SMP or not to SMP To: Ian Smith In-Reply-To: <20130109032940.H30575@sola.nimnet.asn.au> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-net@freebsd.org X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 08 Jan 2013 23:15:36 -0000 --- On Tue, 1/8/13, Ian Smith wrote: > From: Ian Smith > Subject: Re: To SMP or not to SMP > To: "Garrett Cooper" > Cc: "Barney Cordoba" , "Erich Dollansky" , freebsd-net@freebsd.org > Date: Tuesday, January 8, 2013, 11:34 AM > On Tue, 8 Jan 2013 07:57:04 -0800, > Garrett Cooper wrote: > > On Jan 8, 2013, at 7:50 AM, Barney Cordoba wrote: > >=20 > > > --- On Mon, 1/7/13, Erich Dollansky > wrote: > > >=20 > > >> From: Erich Dollansky > > >> Subject: Re: To SMP or not to SMP > > >> To: "Barney Cordoba" > > >> Cc: freebsd-net@freebsd.org > > >> Date: Monday, January 7, 2013, 10:56 PM > > >> Hi, > > >>=20 > > >> On Mon, 7 Jan 2013 18:25:58 -0800 (PST) > > >> Barney Cordoba > > >> wrote: > > >>=20 > > >>> I have a situation where I have to run > 9.1 on an old > > >> single core box. > > >>> Does anyone have a handle on whether it's > better to > > >> build a non SMP > > >>> kernel or to just use a standard SMP > build with just > > >> the one core? > > >>> Thanks. > > >>=20 > > >> I ran a single CPU version of FreeBSD until > my last single > > >> CPU got hit > > >> by a lightning last April or May without any > problems. > > >>=20 > > >> I never saw a reason to include the overhead > of SMP for this > > >> kind of > > >> machine and I also never ran into problems > with this. > > >=20 > > > Another "ass"umption based on logic rather than > empirical evidence. > >=20 > > =A0=A0=A0 It isn't really an offhanded > assumption because there _is_=20 > > additional overhead added into the kernel structures > to make things=20 > > work SMP with locking :). Whether or not it's > measurable for you and=20 > > your applications, I have no idea. > > HTH, > > -Garrett >=20 > Where's Kris Kennaway when you need something compared, > benchmarked=20 > under N different types of loads, and nicely graphed?=A0 > Do we have a=20 > contender? :) >=20 > cheers, Ian I don't need no stinking graphs. I'll do some testing. bc