netdev - Re: Softirqs without captured packets

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Date:	Sat, 09 Feb 2013 17:16:02 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Javier Domingo <javierdo1@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: Softirqs without captured packets

On Sat, 2013-02-09 at 21:27 +0100, Javier Domingo wrote:
> Can you tell me something about the traces I introduced?
> 
> I tried to insert the trace the cleanest way possible. I patched
> dev.c, in the measurement places and tried to make the module the more
> independent I could. It makes the measure with sched_clock() and in
> each round, it sums up the work done.
> 
> I have supposed that that softirq is just for capturing packets, so
> that is why I asked my first question,

Seems pretty easy to understand to me.

A network device receives and transmits packets.

n->poll() call done in net_rx_action() can both :

- Receive packets
- Perform the TX completion for most devices (some of them still
  use a hard IRQ driven TX completion path)

The return value is only about receive part.

(The TX completion is not limited by a per round quota)



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