Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759619AbYFZN4i (ORCPT ); Thu, 26 Jun 2008 09:56:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758653AbYFZN4Y (ORCPT ); Thu, 26 Jun 2008 09:56:24 -0400 Received: from smtp-out03.alice-dsl.net ([88.44.63.5]:10215 "EHLO smtp-out03.alice-dsl.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758529AbYFZN4X (ORCPT ); Thu, 26 Jun 2008 09:56:23 -0400 To: Linux Kernel , svaidy@linux.vnet.ibm.com Cc: Suresh B Siddha , Venkatesh Pallipadi , Ingo Molnar , Peter Zijlstra , Dipankar Sarma , Balbir Singh , Vatsa , Gautham R Shenoy Subject: Re: [RFC v1] Tunable sched_mc_power_savings=n From: Andi Kleen References: <20080625191100.GI21892@dirshya.in.ibm.com> Date: Thu, 26 Jun 2008 15:49:01 +0200 In-Reply-To: <20080625191100.GI21892@dirshya.in.ibm.com> (Vaidyanathan Srinivasan's message of "Thu, 26 Jun 2008 00:41:00 +0530") Message-ID: <87k5gcqpbm.fsf@basil.nowhere.org> User-Agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 26 Jun 2008 13:41:44.0016 (UTC) FILETIME=[5F104D00:01C8D792] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 969 Lines: 22 Vaidyanathan Srinivasan writes: > > The idea being proposed is to enhance the tunable with varied degrees > of consolidation that can work best for different workload > characteristics. echo 2 > /sys/.../sched_mc_power_savings could > enable more aggressive consolidation than the default. It would be better to fix the single power saving default to work better with bursty workloads too than to add more tunables. Tunables are basically "we give up, let's push the problem to the user" which is not nice. I suspect a lot of users won't even know if their workloads are bursty or not. Or they might have workloads which are both bursty and not bursty. Or did you try that and failed? -Andi -- 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/