From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964816AbVHOQOJ (ORCPT ); Mon, 15 Aug 2005 12:14:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964817AbVHOQOJ (ORCPT ); Mon, 15 Aug 2005 12:14:09 -0400 Received: from e33.co.us.ibm.com ([32.97.110.131]:45186 "EHLO e33.co.us.ibm.com") by vger.kernel.org with ESMTP id S964816AbVHOQOI (ORCPT ); Mon, 15 Aug 2005 12:14:08 -0400 Date: Mon, 15 Aug 2005 21:05:41 +0530 From: Srivatsa Vaddagiri To: Con Kolivas Cc: ck@vds.kolivas.org, tony@atomide.com, tuukka.tikkanen@elektrobit.com, akpm@osdl.org, johnstul@us.ibm.com, linux-kernel@vger.kernel.org, ak@muc.de, george@mvista.com Subject: Re: [ck] [PATCH] dynamic-tick patch modified for SMP Message-ID: <20050815153541.GA4731@in.ibm.com> Reply-To: vatsa@in.ibm.com References: <20050812201946.GA5327@in.ibm.com> <200508140053.21056.kernel@kolivas.org> <20050813164618.GA4659@in.ibm.com> <200508141018.29668.kernel@kolivas.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200508141018.29668.kernel@kolivas.org> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Aug 14, 2005 at 10:18:28AM +1000, Con Kolivas wrote: > timers that made no progress until interrupts drove the timers on again. I > built in both PIT and APIC dyntick mode into the kernel and the default in > the way I modified the patch is for APIC mode to be used if it's built in. > After that I modified the values using the sysfs interface at > /sys/devices/system/dyn_tick/dyn_tick0/. In APIC mode it seems to run close to Con, I am observing the reverse problem - my patch does not work in APIC mode. I am thinking it has to do something with disabling PIT interrupts. Have you enabled CONFIG_DYN_TICK_USE_APIC in my patch? What does /sys/.../dyn_tick0/state show when my patch is working (in APIC mode for you)? Can you disable CONFIG_DYN_TICK_USE_APIC with my patch and check if it works? Also can you send me 'dmesg | grep APIC' (want to know if your hardware has local APIC that is enabled by the kernel). -- Thanks and Regards, Srivatsa Vaddagiri, Linux Technology Center, IBM Software Labs, Bangalore, INDIA - 560017