[ECOS] TCP/IP stack performance

[ECOS] TCP/IP stack performance

[Neeraja]

Hi,
      I am working on AT91RM9200 board.  The TCP/IP stack is working
perfectly fine with this board.
     But the problem is that at times the ping reply is taking very
long(some 3 to 4 seconds) which usually will be only 2 or 3ms and is also
timing out in between when it is taking long time to reply back. But the
good thing is that 
the TCP/IP stack is not dying completely and is slowly resuming back to
normal after some time( that is it is getting the ping reply within 2 t0 3
ms).
      Why is this happening and is there any way that the performance can be
improved?
     Anyone suggestions regrading this could be of great help.

Thanks & Regards,
Neeraja.
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Re: [ECOS] TCP/IP stack performance

[Jürgen Lambrecht]

The TCP/IP stack uses threads with the priorities listed below. Maybe 
you use the same priorities in your application?


      1.12 ecos default priorities

Priorities go from 0 to 31

*priority name* 	*default* 	*own* 	*stack name* 	*default* 	*own*
CYGSEM_KERNEL_SYNCH_MUTEX_PRIORITY_INVERSION_PROTOCOL_DEFAULT_PRIORITY 	0 
	  	  	  	 
  	  	  	  	  	 
CYGPKG_NET_FAST_THREAD_PRIORITY 	6 	~ 	  	  	 
CYGPKG_NET_THREAD_PRIORITY 	7 	~ 	  	  	 
CYGPKG_NET_DHCP_THREAD_PRIORITY 	8 	  	  	  	 
CYGINT_NET_IPV6_ROUTING_THREAD_PRIORITY 	8 	  	  	  	 
CYGNUM_LIBC_MAIN_THREAD_PRIORITY  	10  	8 
CYGNUM_LIBC_MAIN_DEFAULT_STACK_SIZE 	8192 	~
CYGPKG_NET_TFTPD_THREAD_PRIORITY 	10 	9 
CYGPKG_NET_TFTPD_THREAD_STACK_SIZE 	3948 	4096
  	  	  	CYGNUM_HAL_COMMON_INTERRUPTS_STACK_SIZE 	4096 	~
  	  	  	  	  	 
  	  	  	  	  	 
CYGNUM_JFFS2_GC_THREAD_PRIORITY 	30 	  	  	  	 
idle thread 	31 	  	  	  	 



Neeraja wrote:

 > Hi,
 >       I am working on AT91RM9200 board.  The TCP/IP stack is working
 > perfectly fine with this board.
 >      But the problem is that at times the ping reply is taking very
 > long(some 3 to 4 seconds) which usually will be only 2 or 3ms and is also
 > timing out in between when it is taking long time to reply back. But the
 > good thing is that
 > the TCP/IP stack is not dying completely and is slowly resuming back to
 > normal after some time( that is it is getting the ping reply within 2 
t0 3
 > ms).
 >       Why is this happening and is there any way that the performance 
can be
 > improved?
 >      Anyone suggestions regrading this could be of great help.
 >
 > Thanks & Regards,
 > Neeraja.

-- 
Jürgen Lambrecht
R&D Engineer
Televic Transport Systems
http://www.televic.com
Televic NV / SA (main office)     
Leo Bekaertlaan 1
B-8870 Izegem
Tel: +32 (0)51 303045
Fax: +32 (0)51 310670


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