[dpdk-dev] [PATCH v3 4/4] app/testpmd: display/clear forwarding stats on demand

[David Marchand]

On Wed, Mar 20, 2019 at 1:25 PM Ferruh Yigit <ferruh.yigit at intel.com> wrote:

> On 3/20/2019 10:02 AM, David Marchand wrote:
> > Add a new "show/clear fwd stats all" command to display fwd and port
> > statistics on the fly.
>
> Won't this be duplicating existing commands:
> "show port stats all|<port_id>"
> "clear port stats all|<port_id>"
>
> What benefit "show/clear fwd stats all" adds against existing ones?
>

Forwarding engines like "iofwd" maintain software statistics like
"fwd_dropped" which gives you how much of the packets to be transmitted
could not make it to the "wire".
"show port stats" won't give you those stats.

You could stop/start the forwarding to get them, but when debugging you
most likely do not want to stop the forwarding.
I have been using this while tracking drops in a PVP setup.


-- 
David Marchand