linux-kernel - Re: When does Linux drop UDP packets?

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Message-Id: <1244137576.3553.3.camel@ht.satnam>
Date:	Thu, 04 Jun 2009 23:16:16 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.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, 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 ;-)

> # cd /sys/kernel/debug

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

> # 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.

--
JSR

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