Poor performance with LWIP and uCOSII on NIOSII

[Altera_Forum]

Hi there, 

 I'm using a niosii system using data (2kb) and instruction cache (4kb) and running ucosii and lwip, and based on an ip gbethernet mac core.  With a very simple (and stupid ...) application, I benchmark the overall performance of this system with a UDP streaming.  The first results concern me a lot:  globally the low level (Interrupt handler, home made driver and VHDL IP core) runs quite well :  interrupt latency => 7usec  delay in the interrupt delay in (Transmission mode) => 6usec   DMA transfert => 10,6usec (for 1024 bytes)  however, even with a simple loop at the application level to send a given number of udp packets (no superfluous job), the first results give me a maximum throughput about 5-6 mbits/sec which is very low.   Does someone have any figure to confirm or to invalidate my results with an equivalent system ?  Thanks in advance.  Gaël

[Altera_Forum]

Your figures are in line with what I would expect, what's your target? 

 If you look at the topic "lwip MicroC/OS-II throughput" in the MicroC/OS-II Forum you will see that 17MBits/s UDP Rx and 35MBits/s UDP Tx have been achieved.

[Altera_Forum]

What do you mean by target ? I'm using a Stratix 2S60 on altera evaluation board. 

 Do you have an idea about the system configuration used to achieve 17Mbits Rx and 35Mbits tx ?  Was it on the altera evaluation board using a standard design ?  Gaël

[Altera_Forum]

Sorry I meant what's your target performance? 

 As for the information on the system, all I know is what's in the posting I referred you to.