Hi Anand,
I did what you said but i am getting a strange output[root@machine0 Desktop]#ls
cli trace.dat.cpu11 trace.dat.cpu2 trace.dat.cpu7
client.c trace.dat.cpu12 trace.dat.cpu3 trace.dat.cpu8
trace.dat.cpu0 trace.dat.cpu13 trace.dat.cpu4 trace.dat.cpu9
trace.dat.cpu1 trace.dat.cpu14 trace.dat.cpu5
trace.dat.cpu10 trace.dat.cpu15 trace.dat.cpu6
[root@hwcentos10 Desktop]# cat trace.dat.cpu
cat: trace.dat.cpu: No such file or directory
[root@machine0 Desktop]# cat trace.dat.cpu0
[root@machine0 Desktop]# tcpc client.c trace.dat.cpu1
-bash: tcpc: command not found
On Wed, Jul 16, 2014 at 12:27 AM, Anand Moon <moon.linux@xxxxxxxxx> wrote:
Hi Anil,
You need to use "trace-cmd record" command and run you client. For example.
I chose to write a tcp simple client server application.
Server running on remote machine listening on some port
I executed below command to connect to the server using trace-cmd record
Below command records all the event and function trace in the kernel,
You can filter these function by passing "-e net:*"
this command will generate a report of all the function that kernel executed.
You can read the report afterwords. using trace-cmd report.
#sudo trace-cmd record -e all ./tcpc 10.0.0.28
#ls
#tcpc tcpc.c trace.dat
#trace-cmd report
You can also user perf command to trace the kernel functions.
#sudo perf record -e probe:tcp_sendmsg
#perf report
perf examples can be found below.
http://www.brendangregg.com/perf.html
-Anand Moon
On Tuesday, July 15, 2014 10:34 PM, Jeff Haran <Jeff.Haran@xxxxxxxxxx> wrote:
This helps me to see the forest for the trees. And it’s pretty current:
http://upload.wikimedia.org/wikipedia/commons/3/37/Netfilter-packet-flow.svg
Jeff Haran
From:kernelnewbies-bounces@xxxxxxxxxxxxxxxxx [mailto:kernelnewbies-bounces@xxxxxxxxxxxxxxxxx] On Behalf Of Anil Joshi
Sent: Tuesday, July 15, 2014 7:38 AM
To: kernelnewbies
Subject: Path of network packet in kernel
Hi All,
I am just new to all this,just wanted to trace the path of the packet since it enter the system(inside the kernel (functions and system calls)) and reaches the destination application.
How to do that.
Regards
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