-----Original Message-----
From: Thomas Monjalon [mailto:thomas@monjalon.net]
Sent: Monday, June 19, 2017 10:13 PM
To: De Lara Guarch, Pablo
Cc: dev@dpdk.org; Wu, Jingjing
Subject: Re: [dpdk-dev] [PATCH v3] app/testpmd: add parameter to start
forwarding TX first

15/06/2017 14:05, De Lara Guarch, Pablo:

quoted

quoted

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 <redacted>
---

--- 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
?

This is a good way to test a loopback connection without having to get into interactive mode.
With the other patch that I sent, to show port statistics periodically
(http://dpdk.org/dev/patchwork/patch/25344/), the app can show how traffic is forwarded
having a simple loopback connection, without anything else required by the user.

Thanks,
Pablo