From f65f2039840942e4d0f0e1af9fb266812d80c466 Mon Sep 17 00:00:00 2001
From: John Ogness <john.ogness@linutronix.de>
Date: Fri, 1 Feb 2019 17:27:09 +0106
Subject: ipc_tcp: add tcpdump commands to README

Signed-off-by: John Ogness <john.ogness@linutronix.de>
---
 schulung_tools/ipc_tcp/README | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/schulung_tools/ipc_tcp/README b/schulung_tools/ipc_tcp/README
index 71222dd..c26ac9f 100644
--- a/schulung_tools/ipc_tcp/README
+++ b/schulung_tools/ipc_tcp/README
@@ -10,6 +10,9 @@ sudo perf probe -x ./recv received=recv.c:62
 # run receiver
 sudo taskset 1 chrt -f 80 ./recv &
 
+# capture traffic
+sudo tcpdump -w ipc_tcp.pcap -i lo &
+
 # run sender (wrapping with trace-cmd)
 sudo trace-cmd record \
 	-e sched:sched_switch \
@@ -21,5 +24,8 @@ sudo trace-cmd record \
 	taskset 1 chrt -f 70 ./send
 # type message and hit return
 
+# stop tcpdump
+sudo killall tcpdump
+
 # view results
 kernelshark
-- 
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