 Technical Support | |
| Home Products Events Support | |
Technical Support
Support Resources
- Support Knowledgebase
- Product Manuals
- Application Notes
- File Download Area
- Product Updates
- Discussion Forum
- Books
Product Information
RL-ARM: REDUCE MEMORY FOOTPRINT OF TCP/IP STACK
Information in this article applies to:
- RL-ARM Version 3
QUESTION
I am running the TCP/IP stack on the Atmel AT91SAM7X device and I need to minimize the RAM occupation of TCP/IP stack. Can we do this by changing the header files?
The traffic in our TCP/IP network will be quite low, therefore I would like to reduce the RAM requirements as much as possible.
ANSWER
Yes. It is possible to reduce the RAM footprint by changing the definitions in the files AT91_EMAC.H and Net_Config.C.
- In the file AT91_EMAC.H the configuration:
/* EMAC Memory Buffer configuration. */ #define NUM_RX_BUF 64
defines the receive buffer size to be 8KB. This buffer might be reduced to 4KB (NUM_RX_BUF = 32) or even to 2KB (NUM_RX_BUF = 16). Reduction to 16 (or below) may cause problems and should be tested on the real network. Note that the size value of the NUM_RX_BUF must be a power of 2. - In the file Net_Config.c the memory pool for dynamic memory allocation can be reduced. Reduction to down to 4096 (= 4KB) is safe and should have no impact on the operation of the TCPnet system. You may change this using the Configuration Wizard (TCPnet System Definitions - MEM_SIZE) or directly in the source code (by changing the #define MEM_SIZE). When your LAN traffic is really low, the MEM_SIZE definition could be reduced even more to get lower RAM usage.
MORE INFORMATION
- RL-ARM User's Guide, TCPnet, Configuring TCPnet
FORUM THREADS
The following Discussion Forum threads may provide information related to this topic.
Last Reviewed: Wednesday, November 19, 2008