Date: Tue, 15 Oct 2013 15:56:15 +0200
From: =?UTF-8?B?U8OpYmFzdGllbiBEdWd1w6k=?= <sebastien.dugue@bull.net>
To: Andi Kleen <andi@firstfloor.org>
CC: Neil Horman <nhorman@tuxdriver.com>, <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, <x86@kernel.org>
Subject: Re: [PATCH] x86: Run checksumming in parallel accross multiple
 alu's
Message-ID: <20131015155615.738f03d5@b012350-ux>
In-Reply-To: <20131015133336.GF2592@two.firstfloor.org>
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	<20131014202528.GG26880@hmsreliant.think-freely.org>
	<20131015091251.2345b918@b012350-ux>
	<20131015133336.GF2592@two.firstfloor.org>
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On Tue, 15 Oct 2013 15:33:36 +0200
Andi Kleen <andi@firstfloor.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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