Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267839AbUIJTdb (ORCPT ); Fri, 10 Sep 2004 15:33:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267830AbUIJTdb (ORCPT ); Fri, 10 Sep 2004 15:33:31 -0400 Received: from mail4.utc.com ([192.249.46.193]:22216 "EHLO mail4.utc.com") by vger.kernel.org with ESMTP id S267850AbUIJTaK (ORCPT ); Fri, 10 Sep 2004 15:30:10 -0400 Message-ID: <4142005C.8070208@cybsft.com> Date: Fri, 10 Sep 2004 14:28:28 -0500 From: "K.R. Foley" Organization: Cybersoft Solutions, Inc. User-Agent: Mozilla Thunderbird 0.7.3 (X11/20040803) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar 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 References: <20040908184231.GA8318@elte.hu> <41411214.4000205@cybsft.com> <4141EAE5.5080202@cybsft.com> <20040910192608.GA18761@elte.hu> In-Reply-To: <20040910192608.GA18761@elte.hu> X-Enigmail-Version: 0.85.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 898 Lines: 29 Ingo Molnar wrote: > * 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 > I will give that a try shortly. kr - 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/