netdev - Softirqs without captured packets

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Message-ID: <CALZVap=wdDnTndwa+Q+MLCufj9YpY-m+wATFiKSTX2bXX-9DVw@mail.gmail.com>
Date:	Fri, 8 Feb 2013 20:41:08 +0100
From:	Javier Domingo <javierdo1@...il.com>
To:	netdev@...r.kernel.org
Subject: Softirqs without captured packets

Hi all,

I have created a tracer module that makes a measure of time at the
start and at the end of a softirq, and also the captured packets in
it.

I have made the measurements using sched_clock() for the time and
summing up the work variable after each poll (in the net_rx_action
polling loop).

I have noticed quite strange results. There are many softirqs that end
up with 0 captured packets.

This is the trace I created and has the following format <start time>
- <end time> : <captured packets>.

As you will notice, thought many of them have some packet captured,
there are many others that don't.

Any help/explanation is welcome!,

Javier Domingo
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