Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264571AbUIOJOq (ORCPT ); Wed, 15 Sep 2004 05:14:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264531AbUIOJOp (ORCPT ); Wed, 15 Sep 2004 05:14:45 -0400 Received: from cantor.suse.de ([195.135.220.2]:54682 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S264571AbUIOJMi (ORCPT ); Wed, 15 Sep 2004 05:12:38 -0400 Date: Wed, 15 Sep 2004 11:12:32 +0200 From: Andi Kleen To: George Anzinger Cc: Christoph Lameter , john stultz , Albert Cahalan , lkml , tim@physik3.uni-rostock.de, Ulrich.Windl@rz.uni-regensburg.de, Len Brown , linux@dominikbrodowski.de, David Mosberger , Andi Kleen , paulus@samba.org, schwidefsky@de.ibm.com, jimix@us.ibm.com, keith maanthey , greg kh , Patricia Gaughen , Chris McDermott Subject: Re: [RFC][PATCH] new timeofday core subsystem (v.A0) Message-ID: <20040915091232.GA22158@wotan.suse.de> References: <1094700768.29408.124.camel@cog.beaverton.ibm.com> <413FDC9F.1030409@mvista.com> <1094756870.29408.157.camel@cog.beaverton.ibm.com> <4140C1ED.4040505@mvista.com> <1095114307.29408.285.camel@cog.beaverton.ibm.com> <41479369.6020506@mvista.com> <4147F774.6000800@mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4147F774.6000800@mvista.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 893 Lines: 19 > I really think a tickless system, for other than UML systems, is a loosing > thing. The accounting overhead on context switch (which increases as the You can run the accounting independently at much lower frequency (10ms is perfectly fine as 2.4 has proven - i suspect even lower would be ok too) IMHO it should be a sysctl so that users can do a trade off between power consumption and accounting accuracy. And there is one important special that doesn't need any accounting for user space at all: the idle loop. It still needs some way to account interrupts, but that could be done in do_IRQ or also do with rather low frequency. -Andi - 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/