Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758228AbZCZJKk (ORCPT ); Thu, 26 Mar 2009 05:10:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752801AbZCZJK2 (ORCPT ); Thu, 26 Mar 2009 05:10:28 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:34607 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756380AbZCZJK1 (ORCPT ); Thu, 26 Mar 2009 05:10:27 -0400 Date: Thu, 26 Mar 2009 10:09:39 +0100 From: Ingo Molnar To: Jan Kara , Oleg Nesterov , Roland McGrath Cc: Linus Torvalds , Theodore Tso , Andrew Morton , Alan Cox , Arjan van de Ven , Peter Zijlstra , Nick Piggin , Jens Axboe , David Rees , Jesper Krogh , Linux Kernel Mailing List Subject: Re: ext3 IO latency measurements (was: Linux 2.6.29) Message-ID: <20090326090939.GA8993@elte.hu> References: <20090324041249.1133efb6.akpm@linux-foundation.org> <20090325123744.GK23439@duck.suse.cz> <20090325150041.GM32307@mit.edu> <20090325185824.GO32307@mit.edu> <20090325215137.GQ32307@mit.edu> <20090325235041.GA11024@duck.suse.cz> <20090326090630.GA9369@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090326090630.GA9369@elte.hu> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.5 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1894 Lines: 43 * Ingo Molnar wrote: > Oh, and while at it - also a job control complaint. I tried to > Ctrl-C the above script: > > file # 858 (253560 bytes), reading it took: 0.06 seconds. > file # 859 (253560 bytes), reading it took: 0.02 seconds. > file # 860 (253560 bytes), reading it took: 5.53 seconds. > file # 861 (253560 bytes), reading it took: 3.70 seconds. > file # 862 (253560 bytes), reading it took: 0.88 seconds. > file # 863 (253560 bytes), reading it took: 0.04 seconds. > file # 864 (253560 bytes), reading it took: ^C0.69 seconds. > file # 865 (253560 bytes), reading it took: ^C0.49 seconds. > file # 866 (253560 bytes), reading it took: ^C0.01 seconds. > file # 867 (253560 bytes), reading it took: ^C0.02 seconds. > file # 868 (253560 bytes), reading it took: ^C^C0.01 seconds. > file # 869 (253560 bytes), reading it took: ^C^C0.04 seconds. > file # 870 (253560 bytes), reading it took: ^C^C^C0.03 seconds. > file # 871 (253560 bytes), reading it took: ^C0.02 seconds. > file # 872 (253560 bytes), reading it took: ^C^C0.02 seconds. > file # 873 (253560 bytes), reading it took: > ^C^C^C^Caldebaran:~/linux/linux/test-files/src> > > I had to hit Ctrl-C numerous times before Bash would honor it. > This to is a very common thing on large SMP systems. [...] It happened when i tried to Ctrl-C the compile job as well: Thu Mar 26 11:04:05 CET 2009 Thu Mar 26 11:06:30 CET 2009 ^CThu Mar 26 11:07:55 CET 2009 ^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^Caldebaran:/home/mingo/linux/linux> a single Ctrl-C is rarely enough to stop busy Bash shell scripts on Linux. Why? 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/