Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753272AbXJAOI3 (ORCPT ); Mon, 1 Oct 2007 10:08:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751733AbXJAOIW (ORCPT ); Mon, 1 Oct 2007 10:08:22 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:36955 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751400AbXJAOIV (ORCPT ); Mon, 1 Oct 2007 10:08:21 -0400 Date: Mon, 1 Oct 2007 07:06:36 -0700 From: Arjan van de Ven To: Andi Kleen Cc: Mikhail Kshevetskiy , Andi Kleen , linux-kernel@vger.kernel.org, Thomas Gleixner Subject: Re: x86_64 and AMD with C1E Message-ID: <20071001070636.2d8e0f9f@laptopd505.fenrus.org> In-Reply-To: <20071001130953.GC17357@one.firstfloor.org> References: <20071001101532.025d652f@localhost> <20071001130953.GC17357@one.firstfloor.org> Organization: Intel X-Mailer: Claws Mail 3.0.1 (GTK+ 2.12.0; 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 Content-Length: 667 Lines: 15 On Mon, 1 Oct 2007 15:09:53 +0200 > There is normally a threshold above which you don't save significantly > more power by doing less timer interrupts. You can test this > by doing the CONFIG_HZ=100 above. however the point you're describing tends to more be around 25ms to 50ms.... HZ=100 is only a first rough test (and HZ=100 does have userspace visibility, multimedia playback suffers due to the decreased accuracy) - 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/