* Re: When does Linux drop UDP packets?
[not found] ` <alpine.DEB.2.00.0906041228170.14994@gandalf.stny.rr.com>
@ 2009-06-04 17:46 ` Jaswinder Singh Rajput
2009-06-04 21:07 ` Steven Rostedt
0 siblings, 1 reply; 2+ messages in thread
From: Jaswinder Singh Rajput @ 2009-06-04 17:46 UTC (permalink / raw)
To: Steven Rostedt; +Cc: Philipp Reh, LKML, netdev
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
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: When does Linux drop UDP packets?
2009-06-04 17:46 ` When does Linux drop UDP packets? Jaswinder Singh Rajput
@ 2009-06-04 21:07 ` Steven Rostedt
0 siblings, 0 replies; 2+ messages in thread
From: Steven Rostedt @ 2009-06-04 21:07 UTC (permalink / raw)
To: Jaswinder Singh Rajput; +Cc: Philipp Reh, LKML, netdev
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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2009-06-04 17:46 ` When does Linux drop UDP packets? Jaswinder Singh Rajput
2009-06-04 21:07 ` Steven Rostedt
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