Re: [lwip-users] Using RTOS dynamic memory allocator

[Martin Velek]

Hello,

I don't think that's a good idea. If you look closer to a memory
allocator documentation http://www.freertos.org/a00111.html, there is
stated:

>Should not be used if the memory being allocated and freed is of a random size 
>- this would only >be the case if tasks being deleted each had a different 
>stack depth, or queues being deleted >were of different lengths.

The pbufs are exactly this case. I suppose the length of eth. packet
from 46B to 1500B.

Anyway, we did a test to verify emac driver, sending udp packets with
length from 100B to 1400B and there was always out_of_ram error even
with reserved 32KB of SRAM for FreeRTOS allocator(heap_2.c). (The data
and pbufs were properly deallocated after receive).

See also 
http://sourceforge.net/projects/freertos/forums/forum/382005/topic/3372370

For this reason we decided to use another dyn. allocator (bget) and
select heap_3.c.


Regards,
Martin



On 24 December 2010 20:01, Anis BEN ABDALLAH <address@hidden> wrote:
> Hello,
>
> I'm using FreeRTOS with LwIP, I would like to use the FreeRTOS dynamic memory 
> allocator instead of the LwIP one.
>
> Could you tell me please what should be done?
>
> Thanks,
> Anis Ben-Abdallah
> Application Engineer
> STMicroelectronics
>
>
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