Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759934Ab2EPMJJ (ORCPT ); Wed, 16 May 2012 08:09:09 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:53479 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751239Ab2EPMJH convert rfc822-to-8bit (ORCPT ); Wed, 16 May 2012 08:09:07 -0400 Subject: Re: Plumbers: Tweaking scheduler policy micro-conf RFP Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: text/plain; charset=us-ascii From: Pantelis Antoniou In-Reply-To: <54348.1337113582@turing-police.cc.vt.edu> Date: Wed, 16 May 2012 15:08:56 +0300 Cc: Peter Zijlstra , Vincent Guittot , mou Chen , linux-kernel@vger.kernel.org, Ingo Molnar , torvalds@linux-foundation.org Content-Transfer-Encoding: 8BIT Message-Id: <3AF99A8F-BF71-43BD-ADB8-4A1FF53F9FFF@gmail.com> References: <833A8DB8-1AB4-45E4-8D44-14A0D782807D@gmail.com> <1337077714.27694.21.camel@twins> <9093E8BA-80E4-4113-B036-0259E5FB44F1@gmail.com> <54348.1337113582@turing-police.cc.vt.edu> To: Valdis.Kletnieks@vt.edu X-Mailer: Apple Mail (2.1084) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1254 Lines: 30 On May 15, 2012, at 11:26 PM, Valdis.Kletnieks@vt.edu wrote: > On Tue, 15 May 2012 14:35:53 +0300, Pantelis Antoniou said: > >> Thermal management: How to distribute load to the processors in such >> a way that the temperature of the die doesn't increase too much that >> we have to either go to a lower OPP or shut down the core all-together. >> This is in direct conflict with throughput since we'd have better performance >> if we could keep the same warmed-up cpu going. > > It's not just "temperature of the die". When you have multiple aisles of 42U > racks full of servers, you often hit "must keep average total BTU load per > server below X" constraints. There's plenty of colo's that are only using 40% > of their floor space due to cooling constraints (you may be able to get the > power company to pull another megawatt of copper into the building, but then > you need to find someplace to put another megawatt worth of cooling). > Interesting, Never thought about that... -- Pantelis -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/