Re: Path of network packet in kernel
Hi Anil, I had written TCP client (tcpc.c) and TCP server (tcps.c) programs for demo and testing purpose. Note : "./tcpc" is the application running under trace-cmd record command. If you want to record the kernel flow for application you can use # trace-cmd record -e all command. # trace-cmd report /* to see the output. */ See the man page of trace-cmd record for example for more details. Please find below link for more details how to filter the output. http://elinux.org/images/3/35/Kernelshark-tut-elc-2011.pdf -Anand Moon On Tuesday, July 22, 2014 4:51 PM, Anil Joshi wrote: 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 why am i getting so much trace.dat.cpu files and tcpc command not found can you please help me out cli is the executable file for client ---Anil On Wed, Jul 16, 2014 at 12:27 AM, Anand Moon 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 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-boun...@kernelnewbies.org >[mailto:kernelnewbies-boun...@kernelnewbies.org] 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 > > > >___ >Kernelnewbies mailing list >Kernelnewbies@kernelnewbies.org >http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Path of network packet in kernel
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 why am i getting so much trace.dat.cpu files and tcpc command not found can you please help me out cli is the executable file for client ---Anil On Wed, Jul 16, 2014 at 12:27 AM, Anand Moon 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 > 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-boun...@kernelnewbies.org [mailto: > kernelnewbies-boun...@kernelnewbies.org] 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 > > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Path of network packet in kernel
a 'slightly' more indepth look: http://www.linuxfoundation.org/images/1/1c/Network_data_flow_through_kernel.png kind regards anupam On Tue, Jul 15, 2014 at 10:33 PM, Jeff Haran 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-boun...@kernelnewbies.org > [mailto:kernelnewbies-boun...@kernelnewbies.org] 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 > > > > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -- In the beginning was the lambda, and the lambda was with Emacs, and Emacs was the lambda. ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Path of network packet in kernel
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 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-boun...@kernelnewbies.org [mailto:kernelnewbies-boun...@kernelnewbies.org] 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
RE: Path of network packet in kernel
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-boun...@kernelnewbies.org [mailto:kernelnewbies-boun...@kernelnewbies.org] 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Path of network packet in kernel
Hi Anil, You can use trace-cmd to trace kernel function flow for any application Below link will help you. http://elinux.org/Ftrace -Anand Moon On Tuesday, July 15, 2014 8:07 PM, Anil Joshi wrote: 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 ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Path of network packet in kernel
This may help - http://hsnlab.tmit.bme.hu/twiki/pub/Targyak/Mar11Cikkek/Network_stack.pdf -- -Meraj On Tue, Jul 15, 2014 at 8:37 PM, Anil Joshi wrote: > 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 > > > ___ > Kernelnewbies mailing list > Kernelnewbies@kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
