Re: When does Linux drop UDP packets?

[Jaswinder Singh Rajput]

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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