From owner-freebsd-net@FreeBSD.ORG Thu Jan 10 00:18:56 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 7F0623F4 for ; Thu, 10 Jan 2013 00:18:56 +0000 (UTC) (envelope-from erichsfreebsdlist@alogt.com) Received: from alogt.com (alogt.com [69.36.191.58]) by mx1.freebsd.org (Postfix) with ESMTP id 482B9939 for ; Thu, 10 Jan 2013 00:18:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=alogt.com; s=default; h=Content-Transfer-Encoding:Content-Type:Mime-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date; bh=fJ0hr0pWvSgvmvfJzRWktG5XCW73XczSTtKMMtbq4uI=; b=W51TnPfb9vEQSxQ3FKe+mprnNMGUzoDeF86jWUWvKOymyuPQMLtt3kGVSJwMzBfhFIV40FXBHw7Z2YtU+LchOo0XGSSWKfUu/X2rDuJC6PxZSuHVXjzxvnuzfXeNEyMF; Received: from [122.129.203.50] (port=34143 helo=X220.ovitrap.com) by sl-508-2.slc.westdc.net with esmtpsa (SSLv3:DHE-RSA-AES128-SHA:128) (Exim 4.80) (envelope-from ) id 1Tt5rC-000sVz-A6; Wed, 09 Jan 2013 17:18:54 -0700 Date: Thu, 10 Jan 2013 07:18:50 +0700 From: Erich Dollansky To: Barney Cordoba Subject: Re: To SMP or not to SMP Message-ID: <20130110071850.191a257c@X220.ovitrap.com> In-Reply-To: <1357742133.9692.YahooMailClassic@web121601.mail.ne1.yahoo.com> References: <20130109211439.5b590bf5@X220.ovitrap.com> <1357742133.9692.YahooMailClassic@web121601.mail.ne1.yahoo.com> X-Mailer: Claws Mail 3.9.0 (GTK+ 2.24.6; amd64-portbld-freebsd10.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - sl-508-2.slc.westdc.net X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - alogt.com X-Get-Message-Sender-Via: sl-508-2.slc.westdc.net: authenticated_id: erichsfreebsdlist@alogt.com X-Source: X-Source-Args: X-Source-Dir: Cc: freebsd-net@freebsd.org, jack.vogel@gmail.com, Mark Atkinson 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: Thu, 10 Jan 2013 00:18:56 -0000 Hi, On Wed, 9 Jan 2013 06:35:33 -0800 (PST) Barney Cordoba wrote: > > This explanation defies the possibility of a GENERIC kernel, which > of course is an important element of a GPOS. Its too bad that smp > support can't be done with logic rather than a kernel option. > it seems to me that you have a very simply view on what SMP means for software. > The big thing I see is the use of legacy interrupts vs msix. Its not > like flipping off SMP support only changes the scheduler behavior. SMP goes into the applications. A single-CPU kernel must still run these kind of applications. Erich