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

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Date:	Tue, 15 Oct 2013 07:06:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sébastien Dugué <sebastien.dugue@...l.net>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Neil Horman <nhorman@...driver.com>,
	linux-kernel@...r.kernel.org, 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 Tue, 2013-10-15 at 15:56 +0200, Sébastien Dugué wrote:
> On Tue, 15 Oct 2013 15:33:36 +0200
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > >   indeed, our typical workload is connected mode IPoIB on mlx4 QDR hardware
> > > where one cannot benefit from hardware offloads.
> > 
> > Is this with sendfile?
> 
>   Tests were done with iperf at the time without any extra funky options, and
> looking at the code it looks like it does plain write() / recv() on the socket.
> 

But the csum cost is both for sender and receiver ?

Please post the following :

perf record -g "your iperf session"

perf report | head -n 200



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