From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760731AbXLADUL (ORCPT ); Fri, 30 Nov 2007 22:20:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758755AbXLADTw (ORCPT ); Fri, 30 Nov 2007 22:19:52 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:50421 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757537AbXLADTv (ORCPT ); Fri, 30 Nov 2007 22:19:51 -0500 Date: Fri, 30 Nov 2007 19:18:16 -0800 From: Arjan van de Ven To: Mark Lord Cc: "Pallipadi, Venkatesh" , Andrew Morton , abelay@novell.com, lenb@kernel.org, mlord@pobox.com, rjw@sisk.pl, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Subject: Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree Message-ID: <20071130191816.3e744205@laptopd505.fenrus.org> In-Reply-To: <4750D180.6080001@rtr.ca> References: <200711302153.lAULrZ7n026255@imap1.linux-foundation.org> <924EFEDD5F540B4284297C4DC59F3DEE2FAE6A@orsmsx423.amr.corp.intel.com> <20071130142058.816d1693.akpm@linux-foundation.org> <924EFEDD5F540B4284297C4DC59F3DEE2FAEAF@orsmsx423.amr.corp.intel.com> <4750CC78.9070105@rtr.ca> <20071130190227.1976e682@laptopd505.fenrus.org> <4750D180.6080001@rtr.ca> Organization: Intel X-Mailer: Claws Mail 3.0.2 (GTK+ 2.12.1; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 30 Nov 2007 22:14:08 -0500 Mark Lord wrote: > > in -mm there is.. the QoS stuff allows you to set maximum tolerable > .. > > That's encouraging, I think, but not for 2.6.24. > > > latency. If your app cant take any latency, you should set those... > > and the side effect is that the kernel will not do long-latency > > C-states or P-state transitions.. > .. > > I don't mind the cpufreq changing (actually, I want it to drop in > cpugfreq to save power and keep the fan off), but the C-states just > kill this app. > > The app is VMware. I force the max_state=1 when launching, ah but then its' even easier... and can be done in 2.6.24 already. VMWare after all has a kernel module, and the latency stuff is in 2.6.23 and 2.6.24 available inside the kernel already. > > I'm not sure about C?? -- it could be C8 or even be C2 or whatever. > I suppose I should find out, but that really takes a lot of fuss > (hours) to measure, and isn't strictly repeatable. (also hope you don't have one of those AMD machines where the bios turns C1 into C2/C3/etc behind the OSes back ;-) -- If you want to reach me at my work email, use arjan@linux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org