Softirqs without captured packets

* Softirqs without captured packets
@ 2013-02-08 19:41 Javier Domingo
  2013-02-08 19:54 ` Javier Domingo
  0 siblings, 1 reply; 14+ messages in thread
From: Javier Domingo @ 2013-02-08 19:41 UTC (permalink / raw)
  To: netdev

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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