[lwip-users] Slow TCP

[Bernard Mentink]

Hi All,

I have just ported lwIP to LPC17xx processor family combined with the QP OS.

What I have tested is UDP and ping works. To test TCP I have included a web server. The page sort of loads, but very slowly and doesn't finish .. also after

the webpage action, pings and UDP no longer work ... so the stack is in a weird state ..

I ran a diagnostic session with Colasoft Capsa 7 package and the gist of it is below:

---------------------------------------------

 All Diagnosis 57

 Application Layer 6 

 HTTP Suspicious Conversation 2 

 HTTP Server Slow Response 4 

 Transport Layer 51 

 TCP Connection Retry 2 

 TCP Retransmission 3 

 TCP Slow Response 45 

 TCP Duplicated Acknowledgement 1     

-----------------------------------------------------------

Having a look at the slow response packets I typically get this:

 Infomation Performance Transport TCP Slow ACK(Packet[103] and Packet[97]from 178 ms) 192.168.0.100   10:1F:E0:12:1D:0C   192.168.0.1     00:19:5B:5D:98:39

 Infomation Performance Transport TCP Slow ACK(Packet[104] and Packet[97]from 178 ms) 192.168.0.100   10:1F:E0:12:1D:0C   192.168.0.1   00:19:5B:5D:98:39  

The Source IP is 192.168.0.100 which is lwIP ..

Can anyone help with how to diagnose this further ..

Many Thanks,

Bernie

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You always have believers and scepticts.. A True inventor is always a believer..