RTCS TCP/IP Task stack size reduction

[CarlFST60L]

Hi Guys,

I am using RTCS which creates a TCP/IP task with 3K of RAM but for my DHCP / TCP / UDP software I have only seen it use well under 1Kb of RAM.

Is it safe to reduce this a little to say 1.5K of RAM? What situations will the TCP/IP task use more RAM?

Here is my task stack usage:

Interrupt stack:    size 00001024    used 00000416

SIZE                  USED                 TASK ID      NAME

00000896(00000380)    00000692(000002B4)   00010001     MAIN_TASK

00000512(00000200)    00000392(00000188)   00010002     X_Task

00000768(00000300)    00000416(000001A0)   00010003     XX_Task

00002304(00000900)    00002144(00000860)   00010004     XXX_Task

00001280(00000500)    00000556(0000022C)   00010005     XXXX_Task

00003328(00000D00)    00002956(00000B8C)   00010006     ETH0_Task

00003000(00000BB8)    00000740(000002E4)   00010007     TCP/IP

[CarlFST60L]

Ok, so I have done some testing...

I can safely reduce the TCP/IP stack, but this is not he problem.

The problem is the TX/RX buffer size are not shown in the task stack usage, I just noticed the high water go crazy. We only send or receive 256 bytes but it has allocated 4K in and 4K out buffers!

[DavidS · Accepted solution]

Hi Carl,

Not certain if this solves the issue but...

Hands-on Workshop: Tower System Solutions, Part 3: Optimizing and Configuring an MQX™ RTOS, Intermed...

FTF-ENT-F0081

Enabling Technologies

Operating Systems

Hands-on Workshop

PDF

The above is from our www.freescale.com/ftf link, click on America's and then Technical Sessions Library.

The general rule of thumb for task stack space is start big and reduce "carefully".

If you have a IDE with TAD (task aware debugging), after running the application through its paces, you can look at the stack space used to get idea of how to adjust.

Regards,

David