From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262219AbULMKnj (ORCPT ); Mon, 13 Dec 2004 05:43:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262220AbULMKnj (ORCPT ); Mon, 13 Dec 2004 05:43:39 -0500 Received: from gprs214-177.eurotel.cz ([160.218.214.177]:40581 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S262219AbULMKne (ORCPT ); Mon, 13 Dec 2004 05:43:34 -0500 Date: Mon, 13 Dec 2004 11:43:21 +0100 From: Pavel Machek To: Con Kolivas Cc: Andrea Arcangeli , linux-kernel@vger.kernel.org Subject: Re: dynamic-hz Message-ID: <20041213104321.GB7340@elf.ucw.cz> References: <20041211142317.GF16322@dualathlon.random> <20041212163547.GB6286@elf.ucw.cz> <20041212222312.GN16322@dualathlon.random> <41BCD5F3.80401@kolivas.org> <20041212234256.GK6272@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > >Actually, I measured about 1W power savings with HZ=100. That's about > >as much as spindown of disk saves... > > How does the popular proprietary operating system cope with this? My > understanding is they run 1000Hz yet they have good power saving and quiet > capacitors. Presumably they do a lot less per timer tick? Doing lot less per timer tick is not going to help much... You cpu needs to awaken, anyway, and awaking of CPU takes lot of time and lot of power, and is probably going to take way more power than execution of timer interrupt. Pavel -- People were complaining that M$ turns users into beta-testers... ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!