From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756046Ab0EXUpd (ORCPT ); Mon, 24 May 2010 16:45:33 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46148 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753047Ab0EXUpc (ORCPT ); Mon, 24 May 2010 16:45:32 -0400 Message-ID: <4BFAE533.6080603@redhat.com> Date: Mon, 24 May 2010 16:44:35 -0400 From: Rik van Riel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.9) Gecko/20100330 Fedora/3.0.4-1.fc12 Lightning/1.0b2pre Thunderbird/3.0.4 MIME-Version: 1.0 To: Ingo Molnar CC: Arjan van de Ven , linux-kernel@vger.kernel.org, davej@redhat.com, Andrew Morton , Peter Zijlstra Subject: Re: [PATCH v2 0/8] Fix performance issue with ondemand governor References: <20100509082126.4a080d46@infradead.org> <20100509174936.GB17881@elte.hu> In-Reply-To: <20100509174936.GB17881@elte.hu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/09/2010 01:49 PM, Ingo Molnar wrote: > * Arjan van de Ven wrote: > >> [Version 2 includes the acks/etc. Andrew: no changes from the patches that >> are in -mm] >> >> There have been various reports of the ondemand governor causing some >> serious performance issues, one of the latest ones from Andrew. There are >> several fundamental issues with ondemand (being worked on), but the report >> from Andrew can be fixed relatively easily. >> >> The fundamental issue is that ondemand will go to a (too) low CPU frequency >> for workloads that alternatingly disk and CPU bound... > > I've applied your series to sched/core and started testing it, thanks Arjan! This code seems to help significantly with some workloads, allowing more systems to use the ondemand governor (and having fewer systems waste power by using the performance governor all the time). It would be nice to see it in 2.6.35 -- All rights reversed