Hi Eric, On Tue, 15 Oct 2013 07:06:25 -0700 Eric Dumazet <eric.duma...@gmail.com> wrote:
> On Tue, 2013-10-15 at 15:56 +0200, Sébastien Dugué wrote: > > 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. > > > > But the csum cost is both for sender and receiver ? No, it was only on the receiver side that I noticed it. > > Please post the following : > > perf record -g "your iperf session" > > perf report | head -n 200 Sorry, but this is 3 years old stuff and I do not have the setup anymore to reproduce. Sébastien. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
