Ethernet performance

[sebestajan]

Posted on October 13, 2009 at 18:30

Ethernet performance

[sarao]

Posted on May 17, 2011 at 09:32

I have an application where I transmit packets that are 1068 bytes (ENET + IP + UDP + My data) at a very high rate (I'll dig up the number later). I cannot afford for a packet to not get sent. I am transmitting images and if 1 packets gets dropped the whole image is lost. To my data I added a 4 byte counter to the transmit packet. At the receiver I check to make sure that all packet counters increase by 1. If 1 packets gets dropped (or comes out of sequence, but my small network I don't have that problem), I know immediately.

This allows me to keep the sender (the STR9) and the receiver (my PC) in synch. I have not seen any stalls that you describe, but I will look more closely and report back.

[alandras]

Posted on May 17, 2011 at 09:32

Hi all,

Janse, packet's can be dropped by the router/switch/hub if you have any betwen the board and your computer. Or maybe even by the computer? What is your configuration? regards, Andras

[abishko]

Posted on May 17, 2011 at 09:32

Hi, all!

We've got a quite problem with STR912FAW ethernet perfomance. Current my step is example code with web server and maximum speed is about 7000 bytes per second. This was tested in Olimex STR-E912 evaluation board. Minimal required perfomance for our device is about 2MBytes per second one-side pocket sending. As I understand from this branch this is quite possible but will require a lot of optimizations. What should I begin with to solve this problem? Could anybody please help me with ready blocks and/or detailed guidance, because my experience in STR9 optimization is not enough yet?

[tomas23]

Posted on May 17, 2011 at 09:32

Anti-Nagle in uip_split.c as first option? Optimized memcopy in one of ST appnotes on STR9 pages? The TCP/IP should be able to deliver around 20 Mbit/s with CRC calculation, if I remember well, from internal RAM and using optimized drivers.