Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266273AbUIIRK5 (ORCPT ); Thu, 9 Sep 2004 13:10:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266289AbUIIRK5 (ORCPT ); Thu, 9 Sep 2004 13:10:57 -0400 Received: from mx1.elte.hu ([157.181.1.137]:42712 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S266273AbUIIRKz (ORCPT ); Thu, 9 Sep 2004 13:10:55 -0400 Date: Thu, 9 Sep 2004 19:12:07 +0200 From: Ingo Molnar To: William Stearns Cc: ML-linux-kernel Subject: Re: 2.6.9-rc1-bk15-VP-R9 latency traces Message-ID: <20040909171207.GA27904@elte.hu> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: 1303 Lines: 36 * William Stearns wrote: > Good day, Ingo, > Thanks for all your work on latency. > > I just rebooted my Dell Inspiron 8200 into 2.6.9-rc1-bk15-VP-R9 > (using your bk12-R9 patch on top of bk15). I got three latency traces > during boot. I realize you're not as worried about those, but I thought > I'd report them anyways. the boot ones can be pretty bad at times and usually they are not a worry: there's no user functionality during bootup so latencies have no ill effects - the bootup itself is one huge 30-60 second latency to the user! If they happen during regular use too they are a problem. (not including latencies that happen when suspending/resuming the laptop.) > The above came from an untainted kernel. Please let me know if > you need any more details. Thanks again for your work. i'd suggest to reset the latency max via this line in /etc/rc.d/rc.local: echo 30 > /proc/sys/kernel/preempt_max_latency this way you can delimit the boot-time ones from the ones that happen later during normal use. 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/