Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263690AbUJ3LQs (ORCPT ); Sat, 30 Oct 2004 07:16:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263691AbUJ3LQs (ORCPT ); Sat, 30 Oct 2004 07:16:48 -0400 Received: from mx2.elte.hu ([157.181.151.9]:55714 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S263690AbUJ3LPt (ORCPT ); Sat, 30 Oct 2004 07:15:49 -0400 Date: Sat, 30 Oct 2004 13:16:40 +0200 From: Ingo Molnar To: Lee Revell Cc: Florian Schmidt , Paul Davis , Thomas Gleixner , LKML , mark_h_johnson@raytheon.com, Bill Huey , Adam Heath , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Karsten Wiese , jackit-devel , Rui Nuno Capela Subject: Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4] Message-ID: <20041030111640.GA23493@elte.hu> References: <20041029193303.7d3990b4@mango.fruits.de> <20041029172151.GB16276@elte.hu> <20041029172243.GA19630@elte.hu> <20041029203619.37b54cba@mango.fruits.de> <20041029204220.GA6727@elte.hu> <20041029233117.6d29c383@mango.fruits.de> <20041029212545.GA13199@elte.hu> <20041030003122.03bcf01b@mango.fruits.de> <1099107364.1551.7.camel@krustophenia.net> <1099108122.1551.12.camel@krustophenia.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1099108122.1551.12.camel@krustophenia.net> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 881 Lines: 20 * Lee Revell wrote: > 835 80000000 0.473ms (+0.000ms): finish_task_switch (__schedule) > 835 80000000 0.474ms (+0.000ms): trace_stop_sched_switched (finish_task_switch) > 835 80000000 0.474ms (+0.849ms): (835) ((49)) > 835 80000000 1.324ms (+0.000ms): do_IRQ (finish_task_switch) > 835 80000000 1.324ms (+0.001ms): do_IRQ ((0)) > 835 80000000 1.325ms (+0.002ms): mask_and_ack_8259A (__do_IRQ) this seems to be very similar to the DMA problems Mark H Johnson had. It is almost certainly not caused by the kernel. It could in theory be some SMM overhead, but the bigger likelyhood is disk DMA. Ingo - 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/