Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755518Ab0AVQFJ (ORCPT ); Fri, 22 Jan 2010 11:05:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753797Ab0AVQFH (ORCPT ); Fri, 22 Jan 2010 11:05:07 -0500 Received: from zrtps0kp.nortel.com ([47.140.192.56]:46399 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753237Ab0AVQFF (ORCPT ); Fri, 22 Jan 2010 11:05:05 -0500 Message-ID: <4B59CB32.5080901@nortel.com> Date: Fri, 22 Jan 2010 09:58:42 -0600 From: "Chris Friesen" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-3.fc11 Thunderbird/3.0 MIME-Version: 1.0 To: Luca Zini CC: Mike Galbraith , Peter Zijlstra , aagaande@gmail.com, rdelcueto@hotmail.com, mingo@elte.hu, linux-kernel , Alex Chiang Subject: Re: scheduler vs hardware? (was Re: another i7 (linux) bug?) References: <201001211258.23499.luca.zini@gmail.com> <1264152314.12530.8.camel@marge.simson.net> <1264152860.4283.1442.camel@laptop> <201001221222.28516.luca.zini@gmail.com> In-Reply-To: <201001221222.28516.luca.zini@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 22 Jan 2010 16:04:20.0813 (UTC) FILETIME=[8ED627D0:01CA9B7C] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 699 Lines: 18 On 01/22/2010 05:22 AM, Luca Zini wrote: > with nice set to 19 a processor 3 reach the maximum speed, with nice set to > -20 its maximum value is 300-400 mhz under the maximum value. I wonder if at lower nice levels the timing on something changes, forcing multiple cores to be active just often enough to keep the i7 from doing the turbo boost thing, whereas with higher nice levels everything is serialized allowing the boost to be enabled. Chris -- 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/