topic Re: RTCS TCP/IP Task stack size reduction in MQX Software Solutions

RTCS TCP/IP Task stack size reduction

CarlFST60L — Tue, 06 Nov 2012 04:48:58 GMT

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

Re: RTCS TCP/IP Task stack size reduction

DavidS — Wed, 07 Nov 2012 16:58:59 GMT

Hi Carl,

Not certain if this solves the issue but...

Hands-on Workshop: Tower System Solutions, Part 3: Optimizing and Configuring an MQX™ RTOS, Intermediate (Reserved Seat Required)

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

Re: RTCS TCP/IP Task stack size reduction

CarlFST60L — Fri, 09 Nov 2012 00:06:16 GMT

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!