From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261396AbVHBGqC (ORCPT ); Tue, 2 Aug 2005 02:46:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261400AbVHBGqC (ORCPT ); Tue, 2 Aug 2005 02:46:02 -0400 Received: from ylpvm15-ext.prodigy.net ([207.115.57.46]:9958 "EHLO ylpvm15.prodigy.net") by vger.kernel.org with ESMTP id S261396AbVHBGp6 (ORCPT ); Tue, 2 Aug 2005 02:45:58 -0400 X-ORBL: [67.117.73.34] Date: Mon, 1 Aug 2005 23:45:36 -0700 From: Tony Lindgren To: James Bruce Cc: David Weinehall , Lee Revell , Pavel Machek , Marc Ballarin , linux-kernel@vger.kernel.org Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers Message-ID: <20050802064535.GC15903@atomide.com> References: <20050730195116.GB9188@elf.ucw.cz> <1122753864.14769.18.camel@mindpipe> <20050730201049.GE2093@elf.ucw.cz> <42ED32D3.9070208@andrew.cmu.edu> <20050731211020.GB27433@elf.ucw.cz> <42ED4CCF.6020803@andrew.cmu.edu> <20050731224752.GC27580@elf.ucw.cz> <1122852234.13000.27.camel@mindpipe> <20050801074447.GJ9841@khan.acc.umu.se> <42EE4B4A.80602@andrew.cmu.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <42EE4B4A.80602@andrew.cmu.edu> User-Agent: Mutt/1.5.6+20040907i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * James Bruce [050801 09:28]: > > Finally, as a conspiracy theorist, I wonder if Linus is just playing us > to get more people working on the tick skipping and highres timer > patches. Someone with the ability to herd cats obviously has to be > sneaky. As an impressive demonstration of my free will I'm going to go > test dyntick on my VIA Epia board... Yeah, I've been running dyntick on my VIA Epia home server for a while now: # uname -r 2.6.12-rc4 # uptime 23:39:46 up 76 days, 9:10, 5 users, load average: 0.00, 0.01, 0.00 # pmstats 5 Current: 0mA Voltage: 0.00mV Power: 0.00W 0mAh Time: 00:00h Ticks: 0HZ Current: 0mA Voltage: 0.00mV Power: 0.00W 0mAh Time: 00:00h Ticks: 33HZ Current: 0mA Voltage: 0.00mV Power: 0.00W 0mAh Time: 00:00h Ticks: 32HZ Current: 0mA Voltage: 0.00mV Power: 0.00W 0mAh Time: 00:00h Ticks: 34HZ Current: 0mA Voltage: 0.00mV Power: 0.00W 0mAh Time: 00:00h Ticks: 35HZ My server is mostly idle, and the average HZ is around 35HZ. This is still with the max HZ set to 1000. With dyntick, the max HZ should be set to something that provides best performance under heavy load on the system. Or least latency or whatever. But AFAIK, it does not make any sense to limit the max HZ because of power savings. That's just a bad compromise. Regards, Tony