From owner-freebsd-stable@FreeBSD.ORG Fri Sep 24 07:12:12 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BA6FB106564A for ; Fri, 24 Sep 2010 07:12:12 +0000 (UTC) (envelope-from john@theusgroup.com) Received: from theusgroup.com (theusgroup.com [64.122.243.222]) by mx1.freebsd.org (Postfix) with ESMTP id A4B878FC14 for ; Fri, 24 Sep 2010 07:12:11 +0000 (UTC) Received: from server.theusgroup.com (localhost.theusgroup.com [127.0.0.1]) by theusgroup.com (Postfix) with ESMTP id BAF5E5F4C for ; Thu, 23 Sep 2010 23:56:31 -0700 (PDT) To: FreeBSD Stable In-reply-to: <4C9B0F2C.20601@FreeBSD.org> References: <4C9B0F2C.20601@FreeBSD.org> Comments: In-reply-to Alexander Motin message dated "Thu, 23 Sep 2010 11:26:20 +0300." Date: Thu, 23 Sep 2010 23:56:31 -0700 From: John Theus Message-Id: <20100924065636.BAF5E5F4C@theusgroup.com> Subject: Re: SuperMicro i7 (UP) - very slow performance X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 24 Sep 2010 07:12:12 -0000 Alexander Motin wrote: >Just to compare, my Core i7-870 with boxed cooler reports: > 31C being idle with tuned power management, > 53C being idle without any power management, > 85C during `make -j16`. >That system did `make -j16 universe` in about 3 hours AFAIR. Another data point and a comment about temperatures. i5-650/H55, half the cores and about 60% the cost compared to the above. 8.1-STABLE amd64 make -j16 universe in 4 hours 5 minutes. all cores running at 100% according to top -P 30C idle 42C max during make I'm a EE and I used to make my living designing microprocessor-based computers. Our design standard for maximum chip temperature was 45C. Above that and the MTBF starts falling fast. Today's motherboards have a lot fewer components, so 45C is too low if you have a single motherboard, but not if you have 100. For the i7-870 above, the intel datasheet says at a maximum power of 95w, the maximum permitted temperature is 72.7C. For the i5-650 at 73w, the maximum permitted temperature is 66C. John Theus TheUsGroup.com