netdev - Re: When does Linux drop UDP packets?

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Message-ID: <alpine.DEB.2.00.0906041706370.14994@gandalf.stny.rr.com>
Date:	Thu, 4 Jun 2009 17:07:47 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
cc:	Philipp Reh <sefi@...-f-i.de>, LKML <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: When does Linux drop UDP packets?


On Thu, 4 Jun 2009, Jaswinder Singh Rajput wrote:

> On Thu, 2009-06-04 at 12:34 -0400, Steven Rostedt wrote:
> 
> > BTW, I used ftrace to look into this:
> > 
> > Enable:
> > 
> > 	CONFIG_FTRACE
> > 	CONFIG_FUNCTION_TRACER
> > 	CONFIG_FUNCITON_GRAPH_TRACER
> > 	CONFIG_DYNAMIC_FTRACE
> > 
> > Compile and boot:
> > 
> > # mount -t debugfs nodev /sys/kernel/debug
> 
> Very glad to see you following standards ;-)

I only did that to not hear the debugfs nazis squack.

> 
> > # cd /sys/kernel/debug
> 
> hmm you mean # cd /sys/kernel/debug/tracing

A mistake I would not have made if I just did /debug

> 
> > # echo udp_rcv > set_graph_function
> > # echo function_graph > current_tracer
> > # cat trace
> > 
> 
> Anyway you can also see UDP packet drops when you increase network and
> CPU load.

That's not the issue here.

-- Steve

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