From having a quick look at the lwIP port (and application) you
provided, I can't see anything wrong. However, I don't have an EVK1100
board to test it. Also, our product is full-duplex only, so no hubs
allowed, which means I cannot test it with our product.
What you describe looks like some kind of resource blocker, so you might
probably best off with *not* disabling asserts and trying to get
assert/error strings to be written to your LCD. You could also try to
creat a task that periodically dumps the lwip_stats somewhere...
Anyway, this doesn't look like a problem in lwIP core, but rather in
your port or something :-(
Simon
Magnus S wrote:
Hello,
we have now tried with the lwip 1.3.2 sample, but with the same result
as before, the problem remain.
We have used the development board EVK1100 together with the example
application "LWIP 1.3.2 with DHCP example".
The example application has been modified to act as a client instead
as a server.
The problem is that when a certain kind of network load is present in
the system, we are able to make the system hang,
so the only way of getting the system to work is the perform a reset.
Below follows a detailed instruction regarding how to reproduce the
problem, including the source code.
In order to reproduce the problem, the EVK1100 board and two PC:s have
been connected to each other with an
ethernet network hub. Note that a switch should not be used, in that
case the problem does not appear.
In our case we used an "Etherprime EP-1008m" ethernet hub. Another
example is "D-Link DE-824TP".
The hub should also be connected to a DHCP server, we used an ethernet
router for this ("D-link DIR-100").
A document that descibes the setup can be found here:
https://sites.google.com/site/ethernetissue/
(See PDF-file in the first link on the page)
One of the PC:s should be setup as a web server. In our case, we used
Ubuntu Linux and the Apache web server.
The other PC should act as a web client, and should repeatedly
download a large file.
In our case a 5 Mb file was used. We configured the PC with Ubuntu
Linux, and used the "wget" tool to download the file.
The following bash command was given:
while [ "true" ]; do wget http://192.168.24.101/mylargefile.JPG;
sleep 1; done
This command downloads a large file from the web server, which will
take a few seconds.
Then is sleeps for one second, and after that the actions are repeated.
The EVK1100 board should run the test software. The source code for
the application can be found at the web page:
https://sites.google.com/site/ethernetissue/
(See the second link on the page, use "File -> Download original" to
download the original zip-file)
This test application is a slightly modified version of the LWIP 1.3.2
example shipped with AVR studio 2.6.0.
The test applicaton will first request an IP address from the DHCP server.
When it has obained an IP address, the application will repeatedly
connect to a web server,
and will download the file in the root folder. This is done repeatedly
with a 10 second delay
between the TCP requests.
In our case we use the built-in web server in the router during the
test, when pages were requested by the EVK1100 applicaton.
However, it should be possible to use the Ubuntu web server as well
for this.
In order to configure the IP address for the web server, change
following line in main.c:
char servername[] = "192.168.24.101";
The actions are printed on the display by the EVK1100-application,
so it is possible to follow what happens. The leds are also indicating
the progress.
When the EVK1100 test application is running without the Ubuntu Linux
web client turned on,
the application will run forever, just as is should, without any problems.
However, when the Ubuntu Linux web client is started with the repeated
wget calls,
the EVK1100 application will hang after a while. Note that the problem
is intermittent,
and it is tricky to reproduce the problem. It might take a while to
reproduce the problem.
However, we are usually able to reproduce the problem within about 10
minutes or so.
When the hanging appears the application will stop, and no more
progress will be indicated on the display.
Note also that the device does not recover when the network load is
turned off.
When the application has been hung, removing the power is the only way
to recover.
It is a bit hard to reproduce the problem, but should be possible to
do within about 10 minutes.
I hope someone could give some advice regarding this, how to proceed
from this point.
/Magnus
2011/9/13 Simon Goldschmidt <[email protected] <mailto:[email protected]>>
Magnus S <[email protected] <mailto:[email protected]>> wrote:
> I use Atmel AVR32 Studio version 2.6.0
OK, got it.
> In our case, we started with an lwip 1.3.0 sample. When 1.3.2 was
> released,
> we upgraded manually, instead of using the Atmel 1.3.2 example.
Well, there seems to be a problem in the 1.3.0 driver (C:\Program
Files\Atmel\AVR Tools\AVR32
Studio\plugins\com.atmel.avr32.sf.uc3_1.7.0.201009140900\framework\1.7.0-AT32UC3\SERVICES\LWIP\lwip-port-1.3.0\AT32UC3A\netif\ethernetif.c)
that has been fixed in the 1.3.2 driver:
ethernetif_input() should call "netif->input(p)" (which correctly
obeys lwIP threading requirements) instead of calling
"ethernet_intput(p)" (which violates threading requirements when
called in multithreading configurations).
Also, you should pass "tcpip_input" as last parameter to
"netif_add()" when using multithreading (NO_SYS defined to 0) and
"ethernet_input" if NO_SYS is defined to 1.
Hope that helps.
> Can you send a link to the possible fix? I did not find the right
> information when i searched.
No, there was no link on the page I found.
Simon
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