RL-ARM TCP Stack and AT91SAM9260-EK EMAC driver issues

Hallo,

Keil RL-ARM ( RTOS and TCP Stack ) provides a EMAC driver for AT91SAM7X microcontroller using AT91SAM7X-EK. I did take this EMAC driver and ported it to AT91SAM9260-EK ( almost the same thing despite different IO pins and so on ).

The EMAC driver is being configured to use MII mode, PCLK is ~200Mhz and MCLK is ~100Mhz. The SAM9260-EK jumpers and resistors where changed in order to make it use MII instead of RMII interface ( Factory Default setting ).

I'm testing TCP and UDP performance using an application that works fine on several ARM based eval board like MCB2300, MCBSTR9 and AT91SAM7X-EK.

Here's what happens when I run those tests on AT91SAM9260-EK.:

UDP:

Average transfer speed is 47.2Mbits, this is working as expected.

TCP SAM9260-EK as a server ( using tcp_listen() and telnet on PC ):

I use telnet as a client and the average throughput is 0.4Mbits. Telnet receives data at maximum speed during a few milliseconds and then it issues a TCPZeroWindow ( no more room to receive any data ). SAM9260-EK will retry sending data after one second ( minimum possible retransmission time on RL-ARM TCP Stack ). So on average the performance is tremendously reduced. During a few milliseconds of data burst speed gets up to 24Mbits.

TCP SAM9260-EK as a client ( using tcp_connect () and a specific TCP application on PC ):

It will never connect. PC application and SAM9260-EK will carry a strange conversation where nobody sens to understand each other ( ...1.95 is SAM9260-EK and ...1.31 is my PC ):

No.     Time        Source                Destination           Protocol Info
      1 0.000000    192.168.1.95          192.168.1.37          TCP      4 > cadlock2 [SYN] Seq=0 Win=5840 Len=0

No.     Time        Source                Destination           Protocol Info
2        0.000036    192.168.1.37          192.168.1.95          TCP      cadlock2 > 4 [RST, ACK] Seq=1 Ack=1 Win=0 Len=0

No.     Time        Source                Destination           Protocol Info
3        0.894013    192.168.1.37          192.168.1.95          TCP      cadlock2 > compressnet [SYN, ACK] Seq=0 Ack=0 Win=65535 Len=0 MSS=1460

No.     Time        Source                Destination           Protocol Info
4        0.999346    192.168.1.95          192.168.1.37          TCP      4 > cadlock2 [RST] Seq=0 Win=5840 Len=0

No.     Time        Source                Destination           Protocol Info
5        0.999387    192.168.1.95          192.168.1.37          TCP      rje > cadlock2 [SYN] Seq=0 Win=5840 Len=0

No.     Time        Source                Destination           Protocol Info
6        0.999410    192.168.1.37          192.168.1.95          TCP      cadlock2 > rje [RST, ACK] Seq=1 Ack=1 Win=0 Len=0

No.     Time        Source                Destination           Protocol Info
7        1.998682    192.168.1.95          192.168.1.37          TCP      rje > cadlock2 [SYN] Seq=0 Win=5840 Len=0

My application must send 40MB of data acquisition from the microcontroller's SDRAM to a PC application that will do some work on it.

An TCP download/upload ( depends on the point of view ) is taking ( 40MB / ( 0.4Mbits / 8 bits ) ) = 800 seconds!

Does anybody have attempted to use AT91SAM9260-EK and RL-ARM TCP/IP Stack with better results?

Does anybody have any test application that I could use in order to see a different scene? I don't mind sending my AT91SAM9260-EK EMAC drivers.

Thanks.
Alex