Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training


Performance FreeRTOS with lwIP

Posted by Joe on January 14, 2007
Hi @all,

I have adapted the FreeRTOS to an LPC2290 from NXP and 75MHz 8MB-Flash/4MB SRam with the lwIP-Stack.
It works fine, but I think it is strange slow.
When I call the vTaskList-function it needs about 3 seconds to fill the buffer with the actual task-functions and to print it out via printf.

Is there anybody who has an idea what the kind of problem it could be or does anybody have an idea how to accelerate the system ?

kind regards


RE: Performance FreeRTOS with lwIP

Posted by Joe on January 15, 2007
anybody = anyone :-)

RE: Performance FreeRTOS with lwIP

Posted by Richard on January 15, 2007
A couple of tips:

1) The function that prints out the tasks is good as a debugging aid, but it keeps interrupts disabled for the entire time that it is creating the table so is not good to use in anger. It needs to do this to capture the system in a consistent state. Creating the table requires multiple list searches and many printf calls so is somewhat lengthy. I suspect that creating this table is causing MAC interrupts to be missed, resulting in timeouts, etc. on the TCP/IP comms.

2) The lwip options in the FreeRTOS.org download are not optimised for any particular system. There have been some good threads on the lwip mailing list recently on how lwip options (buffer sizes, window sizes, etc.) can be optimised.


[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]

Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.

Free TCP/IP and file system demos for the RTOS

Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists