From owner-freebsd-smp@FreeBSD.ORG Thu Feb 12 14:36:16 2009 Return-Path: Delivered-To: freebsd-smp@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B0472106564A for ; Thu, 12 Feb 2009 14:36:16 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from cyrus.watson.org (cyrus.watson.org [65.122.17.42]) by mx1.freebsd.org (Postfix) with ESMTP id 818828FC15 for ; Thu, 12 Feb 2009 14:36:16 +0000 (UTC) (envelope-from jhb@freebsd.org) Received: from server.baldwin.cx (pool-98-109-39-197.nwrknj.fios.verizon.net [98.109.39.197]) by cyrus.watson.org (Postfix) with ESMTPSA id 2F43E46B42; Thu, 12 Feb 2009 09:36:16 -0500 (EST) Received: from localhost (john@localhost [127.0.0.1]) (authenticated bits=0) by server.baldwin.cx (8.14.3/8.14.3) with ESMTP id n1CEZWYM034674; Thu, 12 Feb 2009 09:36:10 -0500 (EST) (envelope-from jhb@freebsd.org) From: John Baldwin To: freebsd-smp@freebsd.org Date: Thu, 12 Feb 2009 08:29:19 -0500 User-Agent: KMail/1.9.7 References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200902120829.19312.jhb@freebsd.org> X-Greylist: Sender succeeded SMTP AUTH authentication, not delayed by milter-greylist-2.0.2 (server.baldwin.cx [127.0.0.1]); Thu, 12 Feb 2009 09:36:10 -0500 (EST) X-Virus-Scanned: ClamAV 0.94.2/8983/Thu Feb 12 07:48:01 2009 on server.baldwin.cx X-Virus-Status: Clean X-Spam-Status: No, score=-4.4 required=4.2 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.1.3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on server.baldwin.cx Cc: James Chang Subject: Re: FreeBSD could use how many cpu(x86) max? X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Feb 2009 14:36:17 -0000 On Thursday 12 February 2009 3:07:30 am James Chang wrote: > Dear all, > > Does any ever try FreeBSD on box that has more than 16 CPU? > > I got an HP ProLiant DL 785 G5 with 32 core (Quad-Core AMD Opteron(tm) > Processor 8356 (2300.10-MHz K8-class CPU) and 256G memory. > When I boot this machine, it could detect 32 core, but only use 16 core!? > > What should do to get FreeBSD 7.1 work with 32 core? > Or, FreeBSD 7.1 only 16 Core Max ? Out of the box FreeBSD only supports 16 CPUs. You can increase that to 32 by changing MAX_CPU in sys/(amd64|i386)/include/param.h and rebuilding. On amd64 you can actually bump it up to 64 if desired. I don't make any promises as to how well the system will perform with that many CPUs enabled though. -- John Baldwin