HI all,
I am using Stellaris LM3S8962 evaluation board and I am trying out LwIP stack
working on top of my own microkernel.
I have implemented sys_arch.c so I could use LwIP with netconn API. I built
simple application which behaves like a simple web
server which sends page with dynamic content. I created html page in such a
way
that browser keep sending requests each second after
first request is made. At the moment everything worked fine. I have ISR which
is called whenever ethernet controler receives or needs to send some data.
This ISR signals a semaphore, and then highest priority task which is blocked
on
that semaphore, is ready to run. I want to mention that I am using stellaris
driver, so my highest priority task calls
stellarisif_interrupt(&ntwrk_intrfc);
function which is part of mentioned stellaris driver. As a result
tcpip thread (lowest priority) is woken and then it wakes task with middle
priority level which listens specified port for incoming connections. This
tasks
also
refreshes page and sends it to client. My stellaris works at 8Mhz....
Because everything seemed fine at the beginning, I tried to start my browser
with lots of tabs, all requesting the same page from stellaris web server.
After a while program ended up in usage or hard fault. Then I figured maybe it
was problem with stack sizes. So I allocated greater stacks for specific tasks
(I saw in debugger that tcpip task needs the biggest stack) and program
executed
well. Then I started more browser tabs, and after a while application stopped
sending pages.
No fault, just stopped sending pages. Now my stack sizes are 128 words except
for tcpip stack which is greater.....
Now my application works for about an hour, serving 25 tabs, and according to
wireshark having about 0.45Mbit/s traffic. After that it just stops sending
pages.
I searched for an error using debugger but it is very difficult since problem
doesn't appear when I am using step by step debugging, or when program is
running
from breakpoint to breakpoint.
So the question is, did someone have similar problem or can someone give me a
hint how to solve this? Is it normal to have some limit of highest traffic
allowed
under this circumstances? I must say I am beginner when it comes to lwIP and
setting its options. Maybe it's lwIP options, or maybe it's just my kernel .....
Please help, I am stuck for days.....
Thanks in advance!!!
Bogdan
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