Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267831AbUIJT2N (ORCPT ); Fri, 10 Sep 2004 15:28:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267830AbUIJT1i (ORCPT ); Fri, 10 Sep 2004 15:27:38 -0400 Received: from mx1.elte.hu ([157.181.1.137]:64420 "EHLO mx1.elte.hu") by vger.kernel.org with ESMTP id S267839AbUIJTYn (ORCPT ); Fri, 10 Sep 2004 15:24:43 -0400 Date: Fri, 10 Sep 2004 21:26:08 +0200 From: Ingo Molnar To: "K.R. Foley" Cc: Mark_H_Johnson@raytheon.com, Lee Revell , Free Ekanayaka , Eric St-Laurent , linux-kernel , Felipe Alfaro Solana , Daniel Schmitt , "P.O. Gaillard" , nando@ccrma.stanford.edu, luke@audioslack.com, free78@tin.it Subject: Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1 Message-ID: <20040910192608.GA18761@elte.hu> References: <20040908184231.GA8318@elte.hu> <41411214.4000205@cybsft.com> <4141EAE5.5080202@cybsft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4141EAE5.5080202@cybsft.com> 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: 821 Lines: 23 * K.R. Foley wrote: > I also have some other traces from this system that I have not seen > before on my slower system. For instance this one where we spend ~204 > usec in __spin_lock_irqsave: > > http://www.cybsft.com/testresults/2.6.9-rc1-bk12-S0/trace1.txt > > Or this one where we spend ~203 usec in sched_clock. That just doesn't > seem possible. > > http://www.cybsft.com/testresults/2.6.9-rc1-bk12-S0/trace4.txt seems quite similar to Mark's IDE-DMA related hardware latencies. Does reducing the DMA mode via hdparm reduce these latencies? 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/