[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [lwip-users] BasicWeb.c behavior
From: |
Bill Auerbach |
Subject: |
RE: [lwip-users] BasicWeb.c behavior |
Date: |
Fri, 8 Feb 2008 14:33:42 -0500 |
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On Behalf
> Of BMW Cyclist RR
> Sent: Friday, February 08, 2008 1:50 PM
> To: address@hidden
> Subject: [lwip-users] BasicWeb.c behavior
>
> I am running lwip v1.2.0 with FreeRTOS 4.2.1 on a AT91SAM7X-EK board with
> an
> X512 chip. I have been actively adding UDP and TCP application programs
> with
> only minor issues, but when trying to resolve a resource (memory) issue
> I've
> dropped back to running just the standard BasicWeb.c webserver so I could
> better understand what the lwipopts.h values actually do in terms of TCP
> internal data structures. I am able to do source level debugging with
> Eclipse and the Amontec JTAGKEY along with OpenOCD.
>
> What I've noticed when running just the Webserver application with my
> other
> tasks disabled (all other FreeRTOS tasks are not created) is that the
> lwip_stats.memp[3] statistics show that the number of TCP_PCBs used seems
> to
> keep getting bumped everytime the webserver returns a webpage. I've got
> MEMP_NUM_TCP_PCB set to 10 (in lwipopts.h) and I see that memp[3].used and
> memp[3].max keep climbing with each web browser connection until the limit
> of 10 is reached. Then I see memp[3].err get incremented while the
> memp[3].used and memp[3].max stay at 10. The webserver continues to
> operate,
> seemingly normally. Is this due to previous TCP connections (i.e..
> webserver) hanging around for a while and continuing to tie up TCP_PCBs?
I can confirm this with 1.3RC? (last week's Update). I didn't notice this
since I could refresh dozens of time without an error, but you are correct,
the used PCBs max out at the maximum and the err count keeps incrementing.
Bill Auerbach