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

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Date:	Tue, 29 Oct 2013 09:25:42 +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:

> 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.  As before however, both the 
> parallel alu run and the prefetch run resulted in speedups, but 
> the two together were not in any way addative.  I'm going to keep 
> playing with the prefetch stride, unless you have an alternate 
> theory.

Could you please cite the exact command-line you used for running 
the test?

Thanks,

	Ingo
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