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

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Message-ID: <20131015155615.738f03d5@b012350-ux>
Date:	Tue, 15 Oct 2013 15:56:15 +0200
From:	Sébastien Dugué <sebastien.dugue@...l.net>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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, 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.

  Sébastien.

> 
> For normal send() the checksum is done in the user copy and for receiving it
> can be also done during the copy in most cases
> 
> -Andi
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