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

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Message-ID: <20131029132009.GB25078@neilslaptop.think-freely.org>
Date:	Tue, 29 Oct 2013 09:20:09 -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 02:11:49PM +0100, Ingo Molnar wrote:
> 
> * Neil Horman <nhorman@...driver.com> wrote:
> 
> > I'm sure it worked properly on my system here, I specificially 
> > checked it, but I'll gladly run it again.  You have to give me an 
> > hour as I have a meeting to run to, but I'll have results shortly.
> 
> So what I tried to react to was this observation of yours:
> 
> > > > Heres my data for running the same test with taskset 
> > > > restricting execution to only cpu0.  I'm not quite sure whats 
> > > > going on here, but doing so resulted in a 10x slowdown of the 
> > > > runtime of each iteration which I can't explain. [...]
> 
> A 10x slowdown would be consistent with not running your testcase 
> but 'perf bench sched messaging' by accident, or so.
> 
> But I was really just guessing wildly here.
> 
> Thanks,
> 
> 	Ingo
> 
Ok, well, I'll run it again in just a bit here.
Neil

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