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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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