From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261503AbVGYUoN (ORCPT ); Mon, 25 Jul 2005 16:44:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261560AbVGYUoM (ORCPT ); Mon, 25 Jul 2005 16:44:12 -0400 Received: from prgy-npn1.prodigy.com ([207.115.54.37]:26118 "EHLO oddball.prodigy.com") by vger.kernel.org with ESMTP id S261503AbVGYUoL (ORCPT ); Mon, 25 Jul 2005 16:44:11 -0400 Message-ID: <42E55012.5040307@tmr.com> Date: Mon, 25 Jul 2005 16:48:18 -0400 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050511 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Andreas Baer CC: linux-kernel@vger.kernel.org, pmarques@grupopie.com Subject: Re: Problem with Asus P4C800-DX and P4 -Northwood- References: <42E4373D.1070607@gmx.net> <20050725051236.GS8907@alpha.home.local> <42E4E4B0.6050904@gmx.net> <20050725152425.GA24568@alpha.home.local> <42E542D5.3080905@gmx.net> In-Reply-To: <42E542D5.3080905@gmx.net> 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 One other oddment about this motherboard, Forgive if I have over-snipped this trying to make it relevant... Andreas Baer wrote: > > Willy Tarreau wrote: > >> On Mon, Jul 25, 2005 at 03:10:08PM +0200, Andreas Baer wrote: >> There clearly is a problem on the system installed on this machine. >> You should >> use strace to see what this machine does all the time, it is >> absolutely not >> expected that the user/system ratios change so much between two nearly >> identical systems. So there are system calls which eat all CPU. You >> may want >> to try strace -Tttt on the running process during a few tens of >> seconds. I >> guess you'll immediately find the culprit amongst the syscalls, and it >> might >> give you a clue. > > > I hope you are talking about a hardware/kernel problem and not a software > problem, because I tried it also with LiveCD's and they showed the same > results > on this machine. > I'm not a linux expert, that means I've never done anything like that > before, > so it would be nice if you give me a hint what you see in this results. :) > Am I misreading this, or is your program doing a bunch of seeks not followed by an i/o operation? I would doubt that's important, but your vmstat showed a lot of system time, and I just wonder if llseek() is more expensive in Linux than Windows. Or if your code is such that these calls are not optimized away by gcc. > strace output for desktop: > <--snip--> > [pid 1431] 1122318636.262578 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017> > [pid 1431] 1122318636.262654 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017> > [pid 1431] 1122318636.262732 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017> > [pid 1431] 1122318636.262809 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.262881 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.262952 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263023 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263094 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.263165 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263237 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.263310 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263381 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263452 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263523 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.263594 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263666 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017> > [pid 1431] 1122318636.263740 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000024> > [pid 1431] 1122318636.263841 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263913 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.263984 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000014> > [pid 1431] 1122318636.264055 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264127 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264199 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264271 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264342 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.264414 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.264487 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264558 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.264630 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264710 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264788 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.264861 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.264934 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.265006 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265077 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265149 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000014> > [pid 1431] 1122318636.265220 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265292 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.265363 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.265436 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265509 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265580 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265652 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.265726 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000017> > [pid 1431] 1122318636.265818 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265891 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.265963 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.266034 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.266106 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.266177 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.266250 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> > [pid 1431] 1122318636.266322 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.266394 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000015> > [pid 1431] 1122318636.266466 _llseek(3, 1761280, [1761280], SEEK_SET) = 0 <0.000016> -- -bill davidsen (davidsen@tmr.com) "The secret to procrastination is to put things off until the last possible moment - but no longer" -me