From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932478AbXA1JQt (ORCPT ); Sun, 28 Jan 2007 04:16:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932480AbXA1JQt (ORCPT ); Sun, 28 Jan 2007 04:16:49 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:51764 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932478AbXA1JQs (ORCPT ); Sun, 28 Jan 2007 04:16:48 -0500 Date: Sun, 28 Jan 2007 10:15:14 +0100 From: Ingo Molnar To: Sunil Naidu Cc: Linux kernel mailing list Subject: Re: 2.6.20-rc6-rt2 - SMP/x86 -- questions about .config selection Message-ID: <20070128091514.GA30685@elte.hu> References: <8355959a0701272135p150bb95dkf62dbfc07c0cdccc@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8355959a0701272135p150bb95dkf62dbfc07c0cdccc@mail.gmail.com> User-Agent: Mutt/1.4.2.2i X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -4.3 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-4.3 required=5.9 tests=ALL_TRUSTED,BAYES_00 autolearn=no SpamAssassin version=3.0.3 -3.3 ALL_TRUSTED Did not pass through any untrusted hosts -1.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Sunil Naidu wrote: > There is some confusion for me while configuring a rt kernel & > proceeding for experiments. I did choose the following:- > > NO_HZ=y > HIGH_RES_TIMERS=y > SMP=y > PREEMPT_VOLUNTARY=y > PREEMPT_SOFTIRQS=y > PREEMPT_HARDIRQS=y > SPINLOCK_BKL=y > CLASSIC_RCU=y > SCHED_SMT=y > IRQBALANCE=y > HZ_1000=y > > > #1 Is this correct to say PREEMPT_VOLUNTARY=y for rt on this desktop > #PC? well, PREEMPT_RT is the best preemption method. > #2 I am not clear about IRQ config selection (which one should be > enable/disable for a PC, I did select all as shown in the above > config). Any suggestion? it's OK. If you select PREEMPT_RT then all the necessary preemption options get auto-selected for you. > #3 Any other parameter(s) I need to enable/disable to get better > results? (did disable APM) check out the configs of the -rt yum repository, those are pretty optimal: http://people.redhat.com/mingo/realtime-preempt/yum/ Ingo