linux-kernel - Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

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Message-ID: <20131029114907.GE24477@neilslaptop.think-freely.org>
Date:	Tue, 29 Oct 2013 07:49:07 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org, sebastien.dugue@...l.net,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

On Tue, Oct 29, 2013 at 12:30:31PM +0100, Ingo Molnar wrote:
> 
> * Neil Horman <nhorman@...driver.com> 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

Neil

> Thanks,
> 
> 	Ingo
> 
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