Re: [dpdk-users] Can not forward the message in DPDK

Re: [dpdk-users] Can not forward the message in DPDK

[Manoj Mallawaarachchi]

Hi Loan,

Thanks for the message to group and sharing the information. I also doing small scale project similar  to this using DPDK forwarder app and as below scenario.

Client PC ----> DPDK forwarder ----> Internet

All connect via home router. I face same issue with client forwarding to DPDK app and to INTERNET and back. Still my objective not work, however I found below discussion will help to your scenario also.

http://dpdk.org/ml/archives/dev/2013-June/000237.html

May be you need to integrate user space TCP/IP stack like ANS.

https://github.com/ansyun/dpdk-ans

I'm also exploring possibilities to my requirement discussed below:

http://www.dpdk.org/ml/archives/users/2017-May/001922.html

Hope my comments useful to get some idea.

Thank you,
Manoj M
--------------------------------------------
On Wed, 5/24/17, LOAN TON <tont@usi.ch> wrote:

 Subject: [dpdk-users] Can not forward the message in DPDK
 To: users@dpdk.org
 Date: Wednesday, May 24, 2017, 7:50 PM
 
 Hi all,
 
 I am a newbie with DPDK. I am doing a
 small project as following.
 
 I have three components such as client
 (one or many), one transporter and one server. The
 transporter and server are in DPDK. I use switch to
 connect  three components together and add rule to
 forward the message between them. The message passing from
 client and transfer to transporter and then to server. The
 server receives the message , opens it and reads some
 information and responds to client and repeats again. One
 client sends a message to transporter and server. At the
 transporter, it only increases the id of message and then
 pass the message to the server. Only when receiving message
 from server, client just sends another one message. Besides,
 after one second, the client have not received the message
 from the server. It will send a new message to the
 transporter and server. The life cycle runs forever until i
 terminate the application.
 
 Model:    Client ->
 Transporter (DPDK) -> Server (DPDK)  
 
 My problem here is the client (for
 example 30 clients) sends a message to transporter. The
 transporter forwards message to server. But the server does
 not receive any message from the transporter.
 I checked some information in my
 transporter, the server and also the switch device (port 30
 is belong to the transporter, port 28 is belong to the
 server). I discovered that when the switch showed err = 2,
 over =2 in the port 30 of the transporter, the server have
 not received any message from the transporter (just my
 thinking, not sure). (You can see some below photos) 
 Or I guessed that I did something wrong in the
 transporter’s code.
 Besides, I also run some experiments
 with different the amount of clients in 15 seconds,
 sometimes the system works, sometimes not. 
 
 Have anyone met such case? Please help
 me to figure out where the error come from. I would be
 grateful for any help
 
 I attach some photos of transporter,
 server, switch info and  the transporter's code because
 maybe I was doing wrong about txbuffer or rte_mbuf.
 
 Best Regards,
 Loan Ton
 
 Here are photo links
 Transporter with 30 clients: http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss> 
 Server with 30 clients: http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR> 
 Switch with 30 clients: http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA> 
 
 I tested the case with 15 clients, one
 transporter, one server. 
 Transporter with 15 clients: http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb> 
 Server with 15 clients: http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj> 
 
 Transporter’s code: http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>

Re: [dpdk-users] Can not forward the message in DPDK

[LOAN TON]

Hi Manoj M,

Have you solved your problem? I still stick on my case.

Loan Ton
> On 26 May 2017, at 11:49 AM, Manoj Mallawaarachchi <manoj_ws@yahoo.com> wrote:
> 
> Hi Loan,
> 
> Thanks for the message to group and sharing the information. I also doing small scale project similar  to this using DPDK forwarder app and as below scenario.
> 
> Client PC ----> DPDK forwarder ----> Internet
> 
> All connect via home router. I face same issue with client forwarding to DPDK app and to INTERNET and back. Still my objective not work, however I found below discussion will help to your scenario also.
> 
> http://dpdk.org/ml/archives/dev/2013-June/000237.html
> 
> May be you need to integrate user space TCP/IP stack like ANS.
> 
> https://github.com/ansyun/dpdk-ans
> 
> I'm also exploring possibilities to my requirement discussed below:
> 
> http://www.dpdk.org/ml/archives/users/2017-May/001922.html
> 
> Hope my comments useful to get some idea.
> 
> Thank you,
> Manoj M
> --------------------------------------------
> On Wed, 5/24/17, LOAN TON <tont@usi.ch> wrote:
> 
> Subject: [dpdk-users] Can not forward the message in DPDK
> To: users@dpdk.org
> Date: Wednesday, May 24, 2017, 7:50 PM
> 
> Hi all,
> 
> I am a newbie with DPDK. I am doing a
> small project as following.
> 
> I have three components such as client
> (one or many), one transporter and one server. The
> transporter and server are in DPDK. I use switch to
> connect  three components together and add rule to
> forward the message between them. The message passing from
> client and transfer to transporter and then to server. The
> server receives the message , opens it and reads some
> information and responds to client and repeats again. One
> client sends a message to transporter and server. At the
> transporter, it only increases the id of message and then
> pass the message to the server. Only when receiving message
> from server, client just sends another one message. Besides,
> after one second, the client have not received the message
> from the server. It will send a new message to the
> transporter and server. The life cycle runs forever until i
> terminate the application.
> 
> Model:    Client ->
> Transporter (DPDK) -> Server (DPDK)  
> 
> My problem here is the client (for
> example 30 clients) sends a message to transporter. The
> transporter forwards message to server. But the server does
> not receive any message from the transporter.
> I checked some information in my
> transporter, the server and also the switch device (port 30
> is belong to the transporter, port 28 is belong to the
> server). I discovered that when the switch showed err = 2,
> over =2 in the port 30 of the transporter, the server have
> not received any message from the transporter (just my
> thinking, not sure). (You can see some below photos) 
> Or I guessed that I did something wrong in the
> transporter’s code.
> Besides, I also run some experiments
> with different the amount of clients in 15 seconds,
> sometimes the system works, sometimes not. 
> 
> Have anyone met such case? Please help
> me to figure out where the error come from. I would be
> grateful for any help
> 
> I attach some photos of transporter,
> server, switch info and  the transporter's code because
> maybe I was doing wrong about txbuffer or rte_mbuf.
> 
> Best Regards,
> Loan Ton
> 
> Here are photo links
> Transporter with 30 clients: http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss> 
> Server with 30 clients: http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR> 
> Switch with 30 clients: http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA> 
> 
> I tested the case with 15 clients, one
> transporter, one server. 
> Transporter with 15 clients: http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb> 
> Server with 15 clients: http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj> 
> 
> Transporter’s code: http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>

Re: [dpdk-users] Can not forward the message in DPDK

[Manoj Mallawaarachchi]

 blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px #715FFA solid !important;  padding-left:1ex !important; background-color:white !important; }  Hi Loan,
Yes, I manage my work with basic forwarder setup as bump in the wire. Now my forwarding working from pc to net and back. Working on multi core support and RSS now.

If it help I can discribe more detail to you.
Thank you,Manoj M
Sent from Yahoo Mail for iPad


On Wednesday, June 7, 2017, 5:34 pm, LOAN TON <tont@usi.ch> wrote:

Hi Manoj M,

Have you solved your problem? I still stick on my case.

Loan Ton
> On 26 May 2017, at 11:49 AM, Manoj Mallawaarachchi <manoj_ws@yahoo.com> wrote:
> 
> Hi Loan,
> 
> Thanks for the message to group and sharing the information. I also doing small scale project similar  to this using DPDK forwarder app and as below scenario.
> 
> Client PC ----> DPDK forwarder ----> Internet
> 
> All connect via home router. I face same issue with client forwarding to DPDK app and to INTERNET and back. Still my objective not work, however I found below discussion will help to your scenario also.
> 
> http://dpdk.org/ml/archives/dev/2013-June/000237.html
> 
> May be you need to integrate user space TCP/IP stack like ANS.
> 
> https://github.com/ansyun/dpdk-ans
> 
> I'm also exploring possibilities to my requirement discussed below:
> 
> http://www.dpdk.org/ml/archives/users/2017-May/001922.html
> 
> Hope my comments useful to get some idea.
> 
> Thank you,
> Manoj M
> --------------------------------------------
> On Wed, 5/24/17, LOAN TON <tont@usi.ch> wrote:
> 
> Subject: [dpdk-users] Can not forward the message in DPDK
> To: users@dpdk.org
> Date: Wednesday, May 24, 2017, 7:50 PM
> 
> Hi all,
> 
> I am a newbie with DPDK. I am doing a
> small project as following.
> 
> I have three components such as client
> (one or many), one transporter and one server. The
> transporter and server are in DPDK. I use switch to
> connect  three components together and add rule to
> forward the message between them. The message passing from
> client and transfer to transporter and then to server. The
> server receives the message , opens it and reads some
> information and responds to client and repeats again. One
> client sends a message to transporter and server. At the
> transporter, it only increases the id of message and then
> pass the message to the server. Only when receiving message
> from server, client just sends another one message. Besides,
> after one second, the client have not received the message
> from the server. It will send a new message to the
> transporter and server. The life cycle runs forever until i
> terminate the application.
> 
> Model:    Client ->
> Transporter (DPDK) -> Server (DPDK)  
> 
> My problem here is the client (for
> example 30 clients) sends a message to transporter. The
> transporter forwards message to server. But the server does
> not receive any message from the transporter.
> I checked some information in my
> transporter, the server and also the switch device (port 30
> is belong to the transporter, port 28 is belong to the
> server). I discovered that when the switch showed err = 2,
> over =2 in the port 30 of the transporter, the server have
> not received any message from the transporter (just my
> thinking, not sure). (You can see some below photos) 
> Or I guessed that I did something wrong in the
> transporter’s code.
> Besides, I also run some experiments
> with different the amount of clients in 15 seconds,
> sometimes the system works, sometimes not. 
> 
> Have anyone met such case? Please help
> me to figure out where the error come from. I would be
> grateful for any help
> 
> I attach some photos of transporter,
> server, switch info and  the transporter's code because
> maybe I was doing wrong about txbuffer or rte_mbuf.
> 
> Best Regards,
> Loan Ton
> 
> Here are photo links
> Transporter with 30 clients: http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss> 
> Server with 30 clients: http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR> 
> Switch with 30 clients: http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA> 
> 
> I tested the case with 15 clients, one
> transporter, one server. 
> Transporter with 15 clients: http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb> 
> Server with 15 clients: http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj> 
> 
> Transporter’s code: http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>

 

Re: [dpdk-users] Can not forward the message in DPDK

[LOAN TON]

Hi Manoj,

Yes, please describe them to me.
Thank you

Best Regards,
Loan Ton
> On 7 Jun 2017, at 6:27 PM, Manoj Mallawaarachchi <manoj_ws@yahoo.com> wrote:
> 
> Hi Loan,
> 
> Yes, I manage my work with basic forwarder setup as bump in the wire. Now my forwarding working from pc to net and back. Working on multi core support and RSS now.
> 
> If it help I can describe more detail to you.
> 
> Thank you,
> Manoj M
> 
> Sent from Yahoo Mail for iPad <https://yho.com/footer0>
> 
> On Wednesday, June 7, 2017, 5:34 pm, LOAN TON <tont@usi.ch> wrote:
> 
> Hi Manoj M,
> 
> Have you solved your problem? I still stick on my case.
> 
> Loan Ton
> 
> > On 26 May 2017, at 11:49 AM, Manoj Mallawaarachchi <manoj_ws@yahoo.com <mailto:manoj_ws@yahoo.com>> wrote:
> > 
> > Hi Loan,
> > 
> > Thanks for the message to group and sharing the information. I also doing small scale project similar  to this using DPDK forwarder app and as below scenario.
> > 
> > Client PC ----> DPDK forwarder ----> Internet
> > 
> > All connect via home router. I face same issue with client forwarding to DPDK app and to INTERNET and back. Still my objective not work, however I found below discussion will help to your scenario also.
> > 
> >  <http://dpdk.org/ml/archives/dev/2013-June/000237.html>http://dpdk.org/ml/archives/dev/2013-June/000237.html <http://dpdk.org/ml/archives/dev/2013-June/000237.html>
> > 
> > May be you need to integrate user space TCP/IP stack like ANS.
> > 
> >  <https://github.com/ansyun/dpdk-ans>https://github.com/ansyun/dpdk-ans <https://github.com/ansyun/dpdk-ans>
> > 
> > I'm also exploring possibilities to my requirement discussed below:
> > 
> >  <http://www.dpdk.org/ml/archives/users/2017-May/001922.html>http://www.dpdk.org/ml/archives/users/2017-May/001922.html <http://www.dpdk.org/ml/archives/users/2017-May/001922.html>
> > 
> > Hope my comments useful to get some idea.
> > 
> > Thank you,
> > Manoj M
> > --------------------------------------------
> > On Wed, 5/24/17, LOAN TON <tont@usi.ch <mailto:tont@usi.ch>> wrote:
> > 
> > Subject: [dpdk-users] Can not forward the message in DPDK
> > To: users@dpdk.org <mailto:users@dpdk.org>
> > Date: Wednesday, May 24, 2017, 7:50 PM
> > 
> > Hi all,
> > 
> > I am a newbie with DPDK. I am doing a
> > small project as following.
> > 
> > I have three components such as client
> > (one or many), one transporter and one server. The
> > transporter and server are in DPDK. I use switch to
> > connect  three components together and add rule to
> > forward the message between them. The message passing from
> > client and transfer to transporter and then to server. The
> > server receives the message , opens it and reads some
> > information and responds to client and repeats again. One
> > client sends a message to transporter and server. At the
> > transporter, it only increases the id of message and then
> > pass the message to the server. Only when receiving message
> > from server, client just sends another one message. Besides,
> > after one second, the client have not received the message
> > from the server. It will send a new message to the
> > transporter and server. The life cycle runs forever until i
> > terminate the application.
> > 
> > Model:    Client ->
> > Transporter (DPDK) -> Server (DPDK)  
> > 
> > My problem here is the client (for
> > example 30 clients) sends a message to transporter. The
> > transporter forwards message to server. But the server does
> > not receive any message from the transporter.
> > I checked some information in my
> > transporter, the server and also the switch device (port 30
> > is belong to the transporter, port 28 is belong to the
> > server). I discovered that when the switch showed err = 2,
> > over =2 in the port 30 of the transporter, the server have
> > not received any message from the transporter (just my
> > thinking, not sure). (You can see some below photos) 
> > Or I guessed that I did something wrong in the
> > transporter’s code.
> > Besides, I also run some experiments
> > with different the amount of clients in 15 seconds,
> > sometimes the system works, sometimes not. 
> > 
> > Have anyone met such case? Please help
> > me to figure out where the error come from. I would be
> > grateful for any help
> > 
> > I attach some photos of transporter,
> > server, switch info and  the transporter's code because
> > maybe I was doing wrong about txbuffer or rte_mbuf.
> > 
> > Best Regards,
> > Loan Ton
> > 
> > Here are photo links
> > Transporter with 30 clients:  <http://imgur.com/a/dQ5ss>http://imgur.com/a/dQ5ss  <http://imgur.com/a/dQ5ss>< <http://imgur.com/a/dQ5ss>http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss>> 
> > Server with 30 clients:  <http://imgur.com/a/WkhBR>http://imgur.com/a/WkhBR  <http://imgur.com/a/WkhBR>< <http://imgur.com/a/WkhBR>http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR>> 
> > Switch with 30 clients:  <http://imgur.com/a/MEPPA>http://imgur.com/a/MEPPA  <http://imgur.com/a/MEPPA>< <http://imgur.com/a/MEPPA>http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA>> 
> > 
> > I tested the case with 15 clients, one
> > transporter, one server. 
> > Transporter with 15 clients:  <http://imgur.com/a/VXHZb>http://imgur.com/a/VXHZb  <http://imgur.com/a/VXHZb>< <http://imgur.com/a/VXHZb>http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb>> 
> > Server with 15 clients:  <http://imgur.com/a/ed4Pj>http://imgur.com/a/ed4Pj  <http://imgur.com/a/ed4Pj>< <http://imgur.com/a/ed4Pj>http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj>> 
> > 
> > Transporter’s code:  <http://codepad.org/I4eDSll3>http://codepad.org/I4eDSll3  <http://codepad.org/I4eDSll3>< <http://codepad.org/I4eDSll3>http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>>

Re: [dpdk-users] Can not forward the message in DPDK

[Manoj Mallawaarachchi]

Hi Loan,

Please find the attached diagram, It's explain the physical connectivity. Hope this help. DPDK box run the basic forwarder app with physical NIC having 1 Gbps x2 slots.

So connectivity between INTERNET and Pc's transparent to PC & INTERNET.

Thank you,
Manoj M
--------------------------------------------
On Wed, 6/7/17, LOAN TON <tont@usi.ch> wrote:

 Subject: Re: [dpdk-users] Can not forward the message in DPDK
 To: "Manoj Mallawaarachchi" <manoj_ws@yahoo.com>
 Cc: users@dpdk.org
 Date: Wednesday, June 7, 2017, 8:31 PM
 
 Hi
 Manoj,
 Yes,
 please describe them to me.Thank you
 Best
 Regards,Loan Ton
 On 7 Jun 2017, at 6:27 PM, Manoj
 Mallawaarachchi <manoj_ws@yahoo.com>
 wrote:
 Hi
 Loan,
 Yes,
 I manage my work with basic forwarder setup as bump in the
 wire. Now my forwarding working from pc to net and back.
 Working on multi core support and RSS now.
 
 If it help I can describe more detail
 to you.
 Thank
 you,Manoj
 M
 Sent from Yahoo Mail for
 iPad
 
 On Wednesday, June 7,
 2017, 5:34 pm, LOAN TON <tont@usi.ch>
 wrote:Hi Manoj M,
 
 Have you solved your problem? I still
 stick on my case.
 
 Loan Ton
 > On 26 May 2017, at 11:49 AM,
 Manoj Mallawaarachchi <manoj_ws@yahoo.com>
 wrote:
 > 
 > Hi Loan,
 > 
 > Thanks for the
 message to group and sharing the information. I also doing
 small scale project similar  to this using DPDK forwarder
 app and as below scenario.
 > 
 > Client PC ---->
 DPDK forwarder ----> Internet
 > 
 > All connect via home
 router. I face same issue with client forwarding to DPDK app
 and to INTERNET and back. Still my objective not work,
 however I found below discussion will help to your scenario
 also.
 > 
 > http://dpdk.org/ml/archives/dev/2013-June/000237.html
 > 
 > May be you need to
 integrate user space TCP/IP stack like ANS.
 > 
 > https://github.com/ansyun/dpdk-ans
 > 
 > I'm also
 exploring possibilities to my requirement discussed
 below:
 > 
 > http://www.dpdk.org/ml/archives/users/2017-May/001922.html
 > 
 > Hope my comments
 useful to get some idea.
 > 
 > Thank you,
 > Manoj M
 >
 --------------------------------------------
 > On Wed, 5/24/17, LOAN TON <tont@usi.ch>
 wrote:
 > 
 > Subject:
 [dpdk-users] Can not forward the message in DPDK
 > To: users@dpdk.org
 > Date: Wednesday, May
 24, 2017, 7:50 PM
 > 
 > Hi all,
 > 
 > I am a newbie with
 DPDK. I am doing a
 > small project as following.
 > 
 > I have three
 components such as client
 > (one or many), one transporter
 and one server. The
 > transporter and server are in
 DPDK. I use switch to
 > connect  three components
 together and add rule to
 > forward the message between them.
 The message passing from
 > client and transfer to
 transporter and then to server. The
 > server receives the message ,
 opens it and reads some
 > information and responds to
 client and repeats again. One
 > client sends a message to
 transporter and server. At the
 > transporter, it only increases
 the id of message and then
 > pass the message to the server.
 Only when receiving message
 > from server, client just sends
 another one message. Besides,
 > after one second, the client have
 not received the message
 > from the server. It will send a
 new message to the
 > transporter and server. The life
 cycle runs forever until i
 > terminate the application.
 > 
 > Model:    Client
 ->
 > Transporter
 (DPDK) -> Server (DPDK)  
 > 
 > My problem here is
 the client (for
 >
 example 30 clients) sends a message to transporter. The
 > transporter forwards
 message to server. But the server does
 > not receive any message from the
 transporter.
 > I
 checked some information in my
 > transporter, the server and also
 the switch device (port 30
 > is belong to the transporter,
 port 28 is belong to the
 > server). I discovered that when
 the switch showed err = 2,
 > over =2 in the port 30 of the
 transporter, the server have
 > not received any message from the
 transporter (just my
 > thinking, not sure). (You can see
 some below photos) 
 > Or I guessed that I
 did something wrong in the
 > transporter’s code.
 > Besides, I also run
 some experiments
 >
 with different the amount of clients in 15 seconds,
 > sometimes the system
 works, sometimes not. 
 > 
 > Have anyone met such
 case? Please help
 >
 me to figure out where the error come from. I would be
 > grateful for any
 help
 > 
 > I attach some photos
 of transporter,
 >
 server, switch info and  the transporter's code
 because
 > maybe I
 was doing wrong about txbuffer or rte_mbuf.
 > 
 > Best Regards,
 > Loan Ton
 > 
 > Here are photo
 links
 > Transporter
 with 30 clients: http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss> 
 > Server with 30
 clients: http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR> 
 > Switch with 30
 clients: http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA> 
 > 
 > I tested the case
 with 15 clients, one
 > transporter, one server. 
 > Transporter with 15
 clients: http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb> 
 > Server with 15
 clients: http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj> 
 > 
 > Transporter’s
 code: http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>
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[dpdk-users] Can not forward the message in DPDK

[LOAN TON]

Hi all,

I am a newbie with DPDK. I am doing a small project as following.

I have three components such as client (one or many), one transporter and one server. The transporter and server are in DPDK. I use switch to connect  three components together and add rule to forward the message between them. The message passing from client and transfer to transporter and then to server. The server receives the message , opens it and reads some information and responds to client and repeats again. One client sends a message to transporter and server. At the transporter, it only increases the id of message and then pass the message to the server. Only when receiving message from server, client just sends another one message. Besides, after one second, the client have not received the message from the server. It will send a new message to the transporter and server. The life cycle runs forever until i terminate the application.

Model:    Client -> Transporter (DPDK) -> Server (DPDK)  

My problem here is the client (for example 30 clients) sends a message to transporter. The transporter forwards message to server. But the server does not receive any message from the transporter.
I checked some information in my transporter, the server and also the switch device (port 30 is belong to the transporter, port 28 is belong to the server). I discovered that when the switch showed err = 2, over =2 in the port 30 of the transporter, the server have not received any message from the transporter (just my thinking, not sure). (You can see some below photos)  Or I guessed that I did something wrong in the transporter’s code.
Besides, I also run some experiments with different the amount of clients in 15 seconds, sometimes the system works, sometimes not. 

Have anyone met such case? Please help me to figure out where the error come from. I would be grateful for any help

I attach some photos of transporter, server, switch info and  the transporter's code because maybe I was doing wrong about txbuffer or rte_mbuf.

Best Regards,
Loan Ton

Here are photo links
Transporter with 30 clients: http://imgur.com/a/dQ5ss <http://imgur.com/a/dQ5ss> 
Server with 30 clients: http://imgur.com/a/WkhBR <http://imgur.com/a/WkhBR> 
Switch with 30 clients: http://imgur.com/a/MEPPA <http://imgur.com/a/MEPPA> 

I tested the case with 15 clients, one transporter, one server. 
Transporter with 15 clients: http://imgur.com/a/VXHZb <http://imgur.com/a/VXHZb> 
Server with 15 clients: http://imgur.com/a/ed4Pj <http://imgur.com/a/ed4Pj> 

Transporter’s code: http://codepad.org/I4eDSll3 <http://codepad.org/I4eDSll3>