Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755186Ab3J2Mwi (ORCPT ); Tue, 29 Oct 2013 08:52:38 -0400 Received: from mail-ea0-f178.google.com ([209.85.215.178]:54174 "EHLO mail-ea0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752823Ab3J2Mwh (ORCPT ); Tue, 29 Oct 2013 08:52:37 -0400 Date: Tue, 29 Oct 2013 13:52:33 +0100 From: Ingo Molnar To: Neil Horman Cc: Eric Dumazet , linux-kernel@vger.kernel.org, sebastien.dugue@bull.net, Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's Message-ID: <20131029125233.GA17449@gmail.com> References: <20131017003421.GA31470@hmsreliant.think-freely.org> <20131017084121.GC22705@gmail.com> <20131028160131.GA31048@hmsreliant.think-freely.org> <20131028162438.GB14350@gmail.com> <20131028174630.GB31048@hmsreliant.think-freely.org> <20131028182913.GD31048@hmsreliant.think-freely.org> <20131029082542.GA24625@gmail.com> <20131029112022.GA24477@neilslaptop.think-freely.org> <20131029113031.GA16897@gmail.com> <20131029114907.GE24477@neilslaptop.think-freely.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131029114907.GE24477@neilslaptop.think-freely.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2129 Lines: 69 * Neil Horman wrote: > On Tue, Oct 29, 2013 at 12:30:31PM +0100, Ingo Molnar wrote: > > > > * Neil Horman wrote: > > > > > Sure it was this: > > > for i in `seq 0 1 3` > > > do > > > echo $i > /sys/module/csum_test/parameters/module_test_mode > > > taskset -c 0 perf stat --repeat 20 -C 0 -ddd perf bench sched messaging -- /root/test.sh > > > done >> counters.txt 2>&1 > > > > > > where test.sh is: > > > #!/bin/sh > > > echo 1 > /sys/module/csum_test/parameters/test_fire > > > > What does '-- /root/test.sh' do? > > > > Unless I'm missing something, the line above will run: > > > > perf bench sched messaging -- /root/test.sh > > > > which should be equivalent to: > > > > perf bench sched messaging > > > > i.e. /root/test.sh won't be run. > > According to the perf man page, I'm supposed to be able to use -- > to separate perf command line parameters from the command I want > to run. And it definately executed test.sh, I added an echo to > stdout in there as a test run and observed them get captured in > counters.txt Well, '--' can be used to delineate the command portion for cases where it's ambiguous. Here's it's unambiguous though. This: perf stat --repeat 20 -C 0 -ddd perf bench sched messaging -- /root/test.sh stops parsing a valid option after the -ddd option, so in theory it should execute 'perf bench sched messaging -- /root/test.sh' where '-- /root/test.sh' is simply a parameter to 'perf bench' and is thus ignored. The message output you provided seems to suggest that to be the case: Performance counter stats for 'perf bench sched messaging -- bash -c echo 1 > /sys/module/csum_test/parameters/test_fire' (20 runs): See how the command executed by perf stat was 'perf bench ...'. Did you want to run: perf stat --repeat 20 -C 0 -ddd /root/test.sh ? Thanks, 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/