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

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Date:	Tue, 29 Oct 2013 14:11:49 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Neil Horman <nhorman@...driver.com>
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


* 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
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