datapoints on 10G throughput with TCP ?

[Jack Vogel]

You can't get line rate with ixgbe, in what configuration/hardware?
We surely do get line rate in validation here, but its sensitive to
your hardware and config.

Jack


On Mon, Dec 5, 2011 at 2:28 PM, Luigi Rizzo <rizzo at iet.unipi.it> wrote:

> On Mon, Dec 05, 2011 at 11:15:09PM +0200, Daniel Kalchev wrote:
> >
> > On Dec 5, 2011, at 9:27 PM, Luigi Rizzo wrote:
> >
> > > - have two machines connected by a 10G link
> > > - on one run "nuttcp -S"
> > > - on the other one run "nuttcp -t -T 5 -w 128 -v the.other.ip"
> > >
> >
> > Any particular tuning of FreeBSD?
>
> actually my point is first to see how good or bad are the defaults.
>
> I have noticed that setting hw.ixgbe.max_interrupt_rate=0
> (it is a tunable, you need to do it before loading the module)
> improves the throughput by a fair amount (but still way below
> line rate with 1500 byte packets).
>
> other things (larger windows) don't seem to help much.
>
> cheers
> luigi
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