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

[address@hidden]

Am 18.12.2018 um 11:15 schrieb Norberto R. de Goes Jr.:
> Hi all. Thanks David Gauchard!
>
> Unfortunately I have been used an old LWIP version in my project, that 
> is in production. I will have problems to update that.
> Please, then does the older versions have this kind of bug I reported?

None that I directly know of, but this kind of behaviour can be the 
result of many bugs or misconfigurations. So while I think it's not a 
bug in lwIP itself (this would have popped up before), I tend to think 
it's not just gone by upgrading lwIP. I guess it's something in your 
port or application (usage of lwIP) that triggers this.

> Or the configuration (lwipopts.h and/or opt.h) can solve that behavior?

Sorry, digging into your config is not a thing I can do right now. 
Debugging such an issue takes more time.

Regards,
Simon

> Regards.
>
>
>
>
>
> Em seg, 17 de dez de 2018 às 10:35, David Gauchard <address@hidden 
> <mailto:address@hidden>> escreveu:
>
>
>     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 <mailto: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.
>
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> --
> Norberto R. de Goes Jr.
> CPqD - DRC
> Tel.: +55 19 3705-4241 / Fax: +55 19 3705-6125
> address@hidden <mailto:address@hidden>
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