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

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Message-ID: <1381785560.2045.11.camel@edumazet-glaptop.roam.corp.google.com>
Date:	Mon, 14 Oct 2013 14:19:20 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Ingo Molnar <mingo@...nel.org>, 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
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple alu's

On Mon, 2013-10-14 at 16:28 -0400, Neil Horman wrote:

> So, early testing results today.  I wrote a test module that, allocated a 4k
> buffer, initalized it with random data, and called csum_partial on it 100000
> times, recording the time at the start and end of that loop.  Results on a 2.4
> GHz Intel Xeon processor:
> 
> Without patch: Average execute time for csum_partial was 808 ns
> With patch: Average execute time for csum_partial was 438 ns

Impressive, but could you try again with data out of cache ?



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