From owner-freebsd-hackers@FreeBSD.ORG Wed Sep 22 10:55:50 2010 Return-Path: Delivered-To: freebsd-hackers@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BFA9A1065674; Wed, 22 Sep 2010 10:55:50 +0000 (UTC) (envelope-from sobomax@FreeBSD.org) Received: from sippysoft.com (gk1.360sip.com [72.236.70.240]) by mx1.freebsd.org (Postfix) with ESMTP id 882BD8FC1A; Wed, 22 Sep 2010 10:55:50 +0000 (UTC) Received: from [192.168.1.38] (S0106005004e13421.vs.shawcable.net [70.71.175.212]) (authenticated bits=0) by sippysoft.com (8.14.3/8.14.3) with ESMTP id o8MAavGC042791 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO); Wed, 22 Sep 2010 03:36:58 -0700 (PDT) (envelope-from sobomax@FreeBSD.org) Message-ID: <4C99DC48.1020208@FreeBSD.org> Date: Wed, 22 Sep 2010 03:36:56 -0700 From: Maxim Sobolev Organization: Sippy Software, Inc. User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.9) Gecko/20100915 Lightning/1.0b2 Thunderbird/3.1.4 MIME-Version: 1.0 To: "current@freebsd.org" , FreeBSD Hackers Content-Type: text/plain; charset=KOI8-U; format=flowed Content-Transfer-Encoding: 7bit Cc: Jeff Roberson Subject: Bumping MAXCPU on amd64? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Sep 2010 10:55:50 -0000 Hi, Is there any reason to keep MAXCPU at 16 in the default kernel config? There are quite few servers on the market today that have 24 or even 32 physical cores. With hyper-threading this can even go as high as 48 or 64 virtual cpus. People who buy such hardware might get very disappointed finding out that the FreeBSD is not going to use such hardware to its full potential. Does anybody object if I'd bump MAXCPU to 32, which is still low but might me more reasonable default these days, or at least make it an kernel configuration option documented in the NOTES? Thanks! -Maxim