[dpdk-dev] [PATCH v3] app/testpmd: add parameter to start forwarding TX first

Bruce Richardson bruce.richardson at intel.com
Tue Jun 20 11:22:39 CEST 2017


On Mon, Jun 19, 2017 at 11:12:53PM +0200, Thomas Monjalon wrote:
> 15/06/2017 14:05, De Lara Guarch, Pablo:
> > > Add parameter to start forwarding sending first
> > > a burst of packets, which is useful when testing
> > > a loopback connection.
> > > 
> > > This was already implemented as an internal command,
> > > but adding it as a parameter is interesting, as it
> > > allows the user to test a loopback connection without
> > > entering in the internal command line.
> > > 
> > > Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
> > > ---
> > > --- a/doc/guides/testpmd_app_ug/run_app.rst
> > > +++ b/doc/guides/testpmd_app_ug/run_app.rst
> > > @@ -188,6 +188,14 @@ The commandline options are:
> > > 
> > >      Start forwarding on initialization.
> > > 
> > > +*   ``--tx-first``
> > > +
> > > +    Start forwarding, after sending a burst of packets first.
> > > +
> > > +.. Note::
> > > +
> > > +   This flag should be only used in non-interactive mode.
> 
> I don't really understand the benefit of this option.
> Why is it better than
> 	echo start tx_first | testpmd -i
> ?

The one big difference I see is normal vs abnormal termination. With the
echo command you suggest, the only way to terminate testpmd is to kill
it via signal. With the extra cmdline option, it will cleanly exit via
enter as with non-interactive mode right now. Not a huge difference, but
I think having the extra argument to enable tx-first is useful.

/Bruce


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