Re: [lwip-users] TCP - problems with large data

[David Gauchard]

Have you tried with LWIP_TCP_SACK_OUT option enabled ?
This option alone solves quite a number of issues on some low-mem devices.

To use it you would need to upgrade to lwIP-2.1.2.

I must take this opportunity to thank all lwIP devs for their work,
this is much appreciated (I'm speaking from esp8266/arduino community).

david

On Mon, Dec 17, 2018 at 09:26:55AM -0200, Norberto R. de Goes Jr. wrote:
> Please, anybody could help me in this my issue?
> Thanks!
> Norberto Goes
> 
> 
> 
> Em dom, 9 de dez de 2018 às 19:18, Norberto R. de Goes Jr. <
> address@hidden> escreveu:
> 
> > Hi, how are you?
> >
> > I have been used the LWIP library for several years already.
> > Now I developed a new application that exchange larger packets, like 2K
> > bytes.
> >
> > Commits in use (SHA-1) :
> >  - lwip :           d70d9bf8660827e2919d5fc9c9469532196225e1
> > - lwip-contrib:   4e553f7b3d3af4ac1f3f6c70f38371e4395fdccd
> >
> > To simulate my real scenario and you can try  to reproduce the problem I
> > am facing,  I have made alterations in the "simhost.c", "lwipopts.h"  and
> > "tcpecho.c" from lwip-contrib. The ethernet data for teh netif is  provided
> > by a socket-raw driver (Linux). The tcpecho just consume the data,  no
> > reply (no echo). The "simhost" (server) is generated with the own Makefile
> > associated avaliable in the "lwip-contrib" git.
> >
> > In addition, I wrote a small "client" (use the TCP-IP/Linux stack).
> > When the "client" sends small packets, all works fine. But when it sends
> > larger packets (for instance, 2048 bytes), just the first are sent fast
> > (normal) but just after the locking occurs.
> >
> > Summary:
> > a) 02 Oracle VMBox (VM#1 and #2) - Linux host
> >
> > b)  Sequence to run:
> >    - VM#1 (server):
> >      >  sudo  your_path1/simhost
> >    - VM#2 (client):
> >      >  your_path2/client ip_netif  port  size_data
> >        - example:    >  ./client 10.0.2.121  5124   2065  /* block */
> >        - example:    >  ./client 10.0.2.121  5124   1000  /* no block  */
> >
> >  c) Altered files (from lwip-contrib), attacheds:
> >         - .../apps/tcpecho/tcpecho.c
> >         - .../ports/unix/proj/unixsim/lwipopts.h
> >         - .../ ports/unix/proj/unixsim/simhost.c
> >
> >  d) Client app (attacheds files)
> >
> > Just to compare, when I use another server with TCP-IP/Linux, not LWIP
> > stack, but the same attached client,  no problem found, including larger
> > packets.
> >
> > Please, what I am doing or configuring wrong ?
> > Thank you very much.