On Tue, 15 Oct 2013 15:33:36 +0200
Andi Kleen <a...@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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